Веб-почта: левое меню вровень с панелью — sticky top 96 → 80 px

Без прокрутки меню стоит на ~86 px, а sticky top-24 (96 px) сдвигал его ниже панели.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,9 @@
+.git
+.idea
+.vscode
+**/node_modules
+**/build
+**/dist
+**/.gradle
+**/.angular
+*.log

.drone.yml

@@ -0,0 +1,47 @@
+# Docker image of reactive-mail-server — like htop-web: Drone builds backend/Dockerfile,
+# master pushes it to the Gitea container registry of jambotron.com.
+#   pull request  -> build only (image is not pushed)
+#   push master   -> gitea.jambotron.com/jambotron_gang/reactive-mail-server:latest and :<commit 8>
+# Drone secrets of this repo: REGISTRY_USERNAME, REGISTRY_PASSWORD (Gitea user with write:package in jambotron_gang)
+kind: pipeline
+type: docker
+name: build-test
+
+trigger:
+  event:
+    - pull_request
+
+steps:
+  - name: build-test
+    image: plugins/docker
+    settings:
+      dockerfile: backend/Dockerfile
+      context: .
+      repo: gitea.jambotron.com/jambotron_gang/reactive-mail-server
+      dry_run: true
+---
+kind: pipeline
+type: docker
+name: build-and-push
+
+trigger:
+  event:
+    - push
+  branch:
+    - master
+
+steps:
+  - name: build-and-push
+    image: plugins/docker
+    settings:
+      dockerfile: backend/Dockerfile
+      context: .
+      registry: gitea.jambotron.com
+      repo: gitea.jambotron.com/jambotron_gang/reactive-mail-server
+      tags:
+        - latest
+        - ${DRONE_COMMIT_SHA:0:8}
+      username:
+        from_secret: REGISTRY_USERNAME
+      password:
+        from_secret: REGISTRY_PASSWORD

README.md

@@ -2,7 +2,23 @@
 
 Почтовый сервер на **Spring Boot WebFlux + R2DBC (PostgreSQL) + Angular**: свой SMTP-сервер на Reactor Netty, веб-почта, очередь отправки, DKIM/SPF/DMARC.
 
-Назначение — наши личные цели (v0.2.3, раздел 75 чек-листа Jambotron): тестовый проект на Jambotron, ловушка почты для dev/staging. Для писем пользователям Jambotron (регистрация, сброс пароля) остаётся Resend.
+Назначение — наша настоящая почта **https://mail.jambocheck.com** (prod Jambotron, системная ВМ, адрес `103.109.235.154`) и тестовый проект на Jambotron.
+
+## Забыл пароль — где взять
+
+**Регистрации нет:** ящики создаёт администратор `admin@jambocheck.com` — веб-почта → Настройки → **MAILBOXES**.
+
+**Администратор:** `admin@jambocheck.com`, пароль `eK-6oj3TMtZgoXVxlvtCWFI6` (начальный, записан 2026-11-07 по решению владельца; сменили — обновить здесь).
+
+Пароли остальных ящиков (`staging@`, `no-reply@`, `monitor@`) — в репозитории Jambotron: `INFRASTRUCTURE/SECRETS.md`, раздел «Почта mail.jambocheck.com».
+
+| Ситуация | Что делать |
+| :--- | :--- |
+| Пароль `admin@` ещё не меняли | файл `/app/data/initial-passwords.txt` **внутри контейнера** `mail` на ВМ почты (в этом репозитории его нет; лежит в томе `data`, передеплой его не стирает). С компьютера: `ssh root@103.109.235.150`, затем `incus exec --project jambotron-prod incust-prod-react-mail-server -- docker exec jambotron-109cf3bb-mail-1 cat /app/data/initial-passwords.txt`. В логе `mail` строка `Mailbox created…` есть **только до первого передеплоя** |
+| Пароль `admin@` сменили и забыли | новый пароль прямо в базе почты, ящик и письма остаются — попросить α/Ω; команда — Jambotron, `INFRASTRUCTURE/test-stands.md`, раздел «Почта mail.jambocheck.com» |
+| Забыт пароль другого ящика (`staging@`, `no-reply@`, `monitor@`, свой) | войти под `admin@` → Настройки → MAILBOXES → ключик у ящика → новый пароль (показывается один раз) и вписать его туда, где ящик настроен |
+
+Всё о prod-почте (порты, DNS, кто через неё шлёт) — Jambotron, `INFRASTRUCTURE/test-stands.md`.
 
 ## Как устроено
 
@@ -13,13 +29,15 @@
 ```
 
 - **Приём (SMTP).** Команды разбираются по строкам (`LineBasedFrameDecoder`): работает и пачка команд в одном пакете, и строка, разорванная на два пакета. Письмо сохраняется или ставится в очередь **до** ответа `250`; если сохранить не удалось — `451`, и отправитель повторит. Работа с базой и DNS идёт не в сетевом потоке.
+- **TLS.** `STARTTLS` на порту SMTP (RFC 3207) и, если задан `SMTPS_PORT`, неявный TLS (RFC 8314, обычно 465); TLS 1.2/1.3. После `STARTTLS` сессия начинается заново (новый `EHLO`), а команды, присланные открытым текстом вместе со `STARTTLS`, не выполняются — соединение закрывается (CVE-2011-0411). `AUTH` предлагается только внутри TLS (или без него при `SMTP_AUTH_WITHOUT_TLS=true`). Сертификат — свой (`MAIL_TLS_CERT` + `MAIL_TLS_KEY`, например Let's Encrypt) или самоподписанный: создаётся один раз в `MAIL_TLS_DIR` и потом переиспользуется. Свой сертификат сервер перечитывает сам, когда файлы меняются (проверка раз в минуту): обновлённый Let's Encrypt подхватывается без перезапуска, недописанный файл не ломает TLS — остаётся прежний сертификат.
 - **Не открытый релей.**
   - Письмо на свой домен принимается от кого угодно.
   - Письмо на чужой домен — только после `AUTH`, иначе `550 5.7.1 Relaying denied`.
   - Вошедший пользователь пишет только от своего адреса, иначе `553`.
 - **Маршрут** (`MailRouter`) один для SMTP и веб-почты:
-  - наш домен → наш ящик, а если ящика нет — «нет такого пользователя»;
-  - задан `MAIL_CATCH_ALL` → всё в этот ящик;
+  - есть такой ящик в нашем домене → в него;
+  - задан `MAIL_CATCH_ALL` → всё остальное (и чужие домены) — в ящик-ловушку, наружу ничего;
+  - наш домен без такого ящика → «нет такого пользователя»;
   - чужой домен → очередь.
 - **Отправка наружу** (`OUTBOUND_MODE`):
   - `off` — ничего не уходит;
@@ -29,6 +47,30 @@
 - **DKIM.** Подпись — `utils-mail-dkim` (rsa-sha256, relaxed/relaxed), проверка входящих — Apache James jDKIM по ключу из DNS отправителя. Ключ создаётся один раз в `DKIM_KEYS_DIR`, запись для DNS печатается в лог при старте: `TXT <selector>._domainkey.<domain>`.
 - **Права.** Письма, папки и вложения отдаются только владельцу (чужие — `404`). Регистрация по умолчанию закрыта, ящики — только в своих доменах.
 
+## IMAP
+
+Почтовые программы (Thunderbird, почта на телефоне) работают с теми же ящиками, что и веб-почта.
+
+- **Порт** `IMAP_PORT` (3143) со `STARTTLS`, и неявный TLS на `IMAPS_PORT` (993), если задан. Сертификат тот же, что у SMTP. Вход (`LOGIN`, `AUTHENTICATE PLAIN`) — только внутри TLS, без него сервер отвечает `LOGINDISABLED`.
+- **Возможности:** IMAP4rev1, LITERAL+, IDLE (новые письма приходят сами, проверка раз в 5 с), UIDPLUS, MOVE, UNSELECT, NAMESPACE, SPECIAL-USE (Отправленные, Черновики, Корзина, Спам клиент находит сам), ID.
+- **UID** выдаёт база (триггер): письмо, перенесённое в папку из веба или по IMAP, получает новый, больший UID — клиент его не пропустит. Флаги `\Seen`, `\Flagged`, `\Answered`, `\Deleted`; `\Draft` — у писем в «Черновиках».
+- **Письмо целиком** (`BODY[]`) — ровно в том виде, в каком оно пришло по SMTP или через `APPEND`. Для писем, написанных в веб-почте, MIME собирается один раз и сохраняется: размер и байты не меняются между запросами.
+- Каждая команда выполняется на рабочем потоке, не на сетевом. Команды, присланные открытым текстом вместе со `STARTTLS`, не выполняются — соединение закрывается.
+- Папки — плоские (без вложенных), имена — modified UTF-7, кириллица работает.
+
+## Веб-почта
+
+Angular 22 в стиле [synthwave-шаблона](frontend/src/assets/synthwave-design-showcase.html): стеклянные панели, неон, движущаяся сетка (выключается в настройках и при `prefers-reduced-motion`), четыре палитры и высокий контраст. Все таблицы — грид [`@jambotron/aria-grid`](https://gitea.jambotron.com/jambotron_gang/jambotron-aria-grid) (сортировка, страницы, выбор строк, массовые действия), пакет — из реестра npm Gitea (`frontend/.npmrc`).
+
+- **Вход и регистрация.** Регистрация (если открыта, `MAIL_REGISTRATION`) — имя ящика в одном из `MAIL_DOMAINS`, после неё вход сразу. Служебные имена (`postmaster`, `abuse`, `admin`…) заняты. Пароль — от 8 символов.
+- **Папки.** Входящие, Черновики, Отправленные, Спам, Корзина и свои (создать, переименовать, удалить — письма уходят в Корзину). Счётчики непрочитанных обновляются раз в 30 с.
+- **Список писем.** Поиск по теме, отправителю, получателям и тексту; флажок; прочитано/не прочитано; перенос в папку, в Спам и обратно; удаление (в Корзину, из Корзины — насовсем); очистка Корзины и Спама.
+- **Письмо.** HTML-письма — в изолированном `iframe` без скриптов, внешние картинки — только по кнопке (отправитель не узнаёт, что письмо открыли). Вложения скачиваются. Заблокировать отправителя — его письма сразу идут в Спам.
+- **Написать.** Несколько адресов в «Кому» и «Копия», подсказки из контактов, ответ, ответ всем, пересылка. Черновик сохраняется сам каждые 15 с; файлы (до 10 МБ) прикрепляются к черновику и уходят вместе с письмом.
+- **Контакты, заблокированные отправители, настройки** (имя, пароль, место, оформление).
+
+API: `GET /api/config` (без входа), `/api/me`, `/api/me/password`, `/api/folders`, `/api/messages` (`PATCH` — `read`/`flagged`/`folderId`), `/api/drafts`, `/api/send` (`draftId` — с вложениями черновика), `/api/contacts`, `/api/spam/blacklist`.
+
 ## Настройки (переменные окружения)
 
 Секреты без значений по умолчанию — без них сервер не стартует. Их можно передать переменными или файлами в `MAILSERVER_SECRETS_DIR` (имя файла = имя переменной).
@@ -40,16 +82,41 @@
 | `DB_HOST`, `DB_PORT`, `DB_NAME`, `DB_USER` | база | `localhost`, `5432`, `mailserver`, `mail` |
 | `MAIL_DOMAINS` | наши домены, через запятую | `localhost` |
 | `MAIL_HOSTNAME` | имя сервера в SMTP | `localhost` |
-| `MAIL_ADMIN_EMAIL`, `MAIL_ADMIN_PASSWORD` | первый ящик на пустой базе; без пароля — случайный, один раз в логе | `admin@<первый домен>` |
+| `MAIL_ADMIN_EMAIL`, `MAIL_ADMIN_PASSWORD` | первый ящик на пустой базе; без пароля — случайный (в `MAIL_PASSWORDS_FILE` или один раз в логе) | `admin@<первый домен>` |
+| `MAIL_ADMINS` | кто управляет ящиками (Настройки → Mailboxes: создать, новый пароль, выключить), через запятую | первый ящик (`MAIL_ADMIN_EMAIL` или `admin@<первый домен>`) |
+| `HTTPS_PORT` | веб-клиент и API по HTTPS тем же сертификатом, что SMTP/IMAP (в `docker-compose.public.yml` — 8443 → 443: `https://mail.<домен>`); 0 — только HTTP на `server.port` | 0 |
+| `MAIL_PASSWORDS_FILE` | файл (права 600), куда дописываются случайные пароли созданных ящиков: первого и ловушки | — (в образе `/app/data/initial-passwords.txt`) |
 | `MAIL_REGISTRATION` | открыть регистрацию | `false` |
-| `MAIL_CATCH_ALL` | ящик-ловушка: вся почта сюда, наружу ничего | — |
+| `MAIL_CATCH_ALL` | ящик-ловушка: письма на адреса без своего ящика здесь (и на чужие домены) — сюда, наружу ничего; ящик создаётся при старте | — |
 | `SMTP_PORT` | порт SMTP | `3025` |
+| `MAIL_TLS` | TLS для SMTP: `STARTTLS` и порт `SMTPS_PORT` | `true` |
+| `MAIL_TLS_CERT`, `MAIL_TLS_KEY` | свой сертификат: PEM-цепочка и ключ (PKCS#8, `RSA PRIVATE KEY` или `EC PRIVATE KEY`); перечитывается при изменении; без них — самоподписанный | — |
+| `MAIL_TLS_DIR` | где лежит самоподписанный сертификат | `./tls` (в образе `/app/data/tls`) |
+| `SMTPS_PORT` | порт неявного TLS (465); `0` — выключен | `0` |
+| `IMAP_ENABLED`, `IMAP_PORT`, `IMAPS_PORT` | IMAP: включён; порт со STARTTLS; порт неявного TLS (`0` — выключен) | `true`, `3143`, `0` |
+| `IMAP_AUTH_WITHOUT_TLS` | вход в IMAP без TLS — **только** в закрытой сети | `false` |
 | `SMTP_AUTH_WITHOUT_TLS` | разрешить `AUTH` без шифрования — **только** в закрытой сети (docker, ВМ) | `false` |
 | `OUTBOUND_MODE` | `off` / `mx` / `smarthost` | `off` |
 | `OUTBOUND_HOST`, `OUTBOUND_PORT`, `OUTBOUND_USERNAME`, `OUTBOUND_PASSWORD`, `OUTBOUND_TLS` | smarthost (`starttls` / `ssl` / `none`) | —, `587`, —, —, `starttls` |
 | `DKIM_DOMAIN`, `DKIM_SELECTOR`, `DKIM_KEYS_DIR` | DKIM | `localhost`, `mail`, `./dkim-keys` |
 | `SPF_ENABLED`, `DMARC_ENABLED` | проверки входящих | `true` |
 | `MAIL_CORS_ORIGINS` | другие источники для веб-клиента (только разработка) | — |
+| `LOGIN_GUARD` | защита от перебора паролей (см. ниже) | `true` |
+| `LOGIN_GUARD_MAX_PER_IP`, `LOGIN_GUARD_MAX_PER_ACCOUNT` | неверных паролей за окно до блокировки: с одного IP; на один ящик с любых IP | `10`, `20` |
+| `LOGIN_GUARD_WINDOW`, `LOGIN_GUARD_BLOCK`, `LOGIN_GUARD_MAX_BLOCK` | окно подсчёта; первая блокировка; потолок (каждая следующая блокировка того же IP вдвое дольше) | `15m`, `15m`, `24h` |
+| `LOGIN_GUARD_TRUSTED_IPS` | IP через запятую, которые не блокируются по IP (ящик всё равно считается) | — |
+
+### Защита от перебора паролей
+
+Один счётчик на всё, где проверяется пароль: `AUTH` в SMTP (25/587/465), `LOGIN`/`AUTHENTICATE` в IMAP, вход в веб-почту, смена пароля.
+
+- **По IP:** 10 неверных паролей за 15 минут → IP заблокирован на 15 минут, следующая блокировка — 30 минут, потом час… до суток. Сутки тишины — счёт сначала.
+- **По ящику:** 20 неверных паролей на один ящик с разных IP (распределённый перебор) → ящик закрыт на 15 минут, **кроме** IP, с которых в него уже входили успешно (30 дней) — так перебором нельзя запереть владельца из его же почтовой программы.
+- Пока блокировка — пароль **не проверяется** вовсе: SMTP `421 4.7.0` и обрыв, IMAP `* BYE` + `NO [UNAVAILABLE]`, веб `429` с `Retry-After`. Неверный пароль отвечается через секунду; после 3 неверных в одном соединении SMTP и IMAP его закрывают.
+- «Нет такого ящика» и «неверный пароль» снаружи не отличить, оба считаются.
+- В логе: `login guard: IP … blocked for 15 min after 10 failed logins (block #1)`.
+- `X-Forwarded-For` веб-входа принимается только от прокси в частной сети (Caddy Jambotron приходит через docker/WireGuard); с публичного адреса заголовок отбрасывается — подменой IP лимит не обойти.
+- Счётчики в памяти: перезапуск их сбрасывает.
 
 ## Разработка
 
@@ -67,19 +134,74 @@ cd frontend && npm install && npx ng serve                         # http://loca
 В мастере деплоя выбрать `docker-compose.jambotron.yml`, домен дать сервису `mail`, порт `8080`.
 
 - Пароль базы и ключ токенов создаёт контейнер `secrets-init` при первом запуске (том `secrets`) — вводить ничего не нужно, в git ничего нет.
-- Первый ящик — `admin@mail.test`, пароль — в логах сервиса `mail` при первом запуске.
+- Ящики `admin@mail.test` (первый) и `trap@mail.test` (ловушка) создаются при старте, их пароли печатаются в лог сервиса `mail` при первом запуске (в Jambotron: проект → Сервисы → `mail` → Логи) и лежат в файле `/app/data/initial-passwords.txt` контейнера `mail` (том `data`, права 600): `docker exec <контейнер mail> cat /app/data/initial-passwords.txt`. Прочитать и сменить пароль в настройках.
+- Регистрация открыта (`MAIL_REGISTRATION=true`): любой может завести ящик в `MAIL_DOMAINS`. Наружу письма не уходят, поэтому для тестового стенда это безопасно; закрыть — `MAIL_REGISTRATION=false`.
 - Наружу открыты только веб-почта и API. SMTP (3025) — внутри сети ВМ, наружу ничего не отправляется (`OUTBOUND_MODE=off`).
 - Домен ящиков — `MAIL_DOMAINS` (по умолчанию `mail.test`).
 
+### Ловушка почты для dev и staging (75.4)
+
+В `docker-compose.jambotron.yml` включена ловушка: `MAIL_CATCH_ALL=trap@mail.test`. Письмо на любой адрес, у которого здесь нет своего ящика, — `user@gmail.com`, `nobody@mail.test` — ложится в ящик `trap@mail.test`; письма между ящиками стенда идут как обычно. Наружу не уходит ничего (`OUTBOUND_MODE=off`), порт 25 и репутация IP не нужны. Выключить — `MAIL_CATCH_ALL=` (пусто).
+
+Чтобы staging Jambotron слал письма сюда вместо Resend, его `spring.mail` смотрит на SMTP этого сервера: хост — адрес, по которому staging видит SMTP 3025, без логина и без TLS. Как: в Jambotron, карточка «Домены» проекта → «Внутренние TCP-порты» → сервис `mail`, порт `3025` (Jambotron PR #781). Адрес `vmIp:vmPort` доступен только в сети WireGuard Jambotron, из интернета — нет.
+
 Образ собирается из `backend/Dockerfile` в три этапа: Angular → Spring Boot (веб-клиент внутри jar) → JRE не от root.
 
+### Готовый Docker-образ
+
+Как у htop-web: Drone (`.drone.yml`) собирает `backend/Dockerfile`. На PR образ только собирается, на `master` уходит в реестр Gitea:
+
+```
+gitea.jambotron.com/jambotron_gang/reactive-mail-server:latest
+gitea.jambotron.com/jambotron_gang/reactive-mail-server:<первые 8 символов коммита master>
+```
+
+Реестр публичный: `docker pull` без логина.
+
+`docker-compose.image.yml` — тот же стенд, что `docker-compose.jambotron.yml`, но сервис `mail` берётся из образа, на ВМ ничего не собирается (деплой быстрее, Node и Gradle на ВМ не нужны). В мастере деплоя Jambotron выбрать этот файл; домен — сервису `mail`, порт `8080`. По умолчанию `latest`, он скачивается заново при каждом деплое (`pull_policy: always`); закрепить сборку — переменная `MAIL_IMAGE_TAG=<8 символов коммита>`.
+
+```bash
+docker compose -f docker-compose.image.yml up -d
+```
+
+### Настоящая почта в интернете (75.6)
+
+`docker-compose.public.yml` — приём писем для `MAIL_DOMAINS` и отправка наружу прямо на MX получателей (`OUTBOUND_MODE=mx`, порт 25), с подписью DKIM; регистрация закрыта, ловушки нет. Нужна своя ВМ с публичным адресом (Jambotron 60.8: «Публичный адрес», SMTP «да» — порт 25 по умолчанию закрыт). На этом адресе открыты:
+
+| Порт | Что |
+|---|---|
+| 25 | SMTP: письма от других серверов (STARTTLS) |
+| 587 | submission для почтовых программ (STARTTLS + вход) — тот же SMTP, что 25 |
+| 465 | SMTPS, неявный TLS |
+| 993 | IMAPS, неявный TLS |
+| 80 | только Let's Encrypt (HTTP-01), сервис `acme` |
+
+Сертификат для `MAIL_HOSTNAME` выпускает и продлевает сервис `acme` (lego, ключ EC256, продление за 30 дней, проверка дважды в сутки); хук кладёт пару в том `tls`, сервер перечитывает её сам. `mail` стартует после первого сертификата. Веб-почта (сервис `mail`, порт `8080`) — через Caddy Jambotron под **другим** именем, например `webmail.<домен>`: `MAIL_HOSTNAME` смотрит на публичный адрес ВМ, а не на Caddy.
+
+Переменные: `MAIL_DOMAINS` (например `jambocheck.com`), `MAIL_HOSTNAME` (`mail.jambocheck.com`), `ACME_EMAIL` (по умолчанию `postmaster@<домен>`).
+
+DNS до первого запуска:
+
+| Запись | Значение |
+|---|---|
+| `A mail.<домен>` | публичный адрес ВМ |
+| PTR публичного адреса | `mail.<домен>` (панель хостера, Reverse DNS) |
+| `MX <домен>` | `10 mail.<домен>` |
+| `TXT <домен>` | `v=spf1 ip4:<публичный адрес> -all` |
+| `TXT _dmarc.<домен>` | `v=DMARC1; p=none; rua=mailto:postmaster@<домен>` |
+| `TXT mail._domainkey.<домен>` | из лога `mail` при первом запуске (ключ DKIM лежит в томе `data`) |
+
+Ящик `admin@<домен>` — пароль в логе `mail` при первом запуске и в `/app/data/initial-passwords.txt`.
+
 ## Не сделано
 
-- [ ] TLS: STARTTLS для SMTP и IMAP. Пока `AUTH` — только в закрытой сети.
-- [ ] IMAP выключен: упрощённый, блокирует сетевой поток (`.block()`). Переписать и проверить с Thunderbird.
-- [ ] Вложения входящих писем не сохраняются (берётся только текст или HTML).
+- [ ] IMAP: проверить с Thunderbird на настоящем адресе; вложенные папки, CONDSTORE/QRESYNC, поиск по `BODY`/`TEXT` без перебора писем.
+- [ ] Пересылка не берёт вложения исходного письма — их надо прикрепить заново.
+- [ ] Встроенные картинки HTML-писем (`cid:`) показываются как вложения, а не внутри письма.
+- [x] Защита входа от перебора: SMTP, IMAP, веб (лимит по IP и по ящику, см. «Защита от перебора паролей»).
+- [ ] Защита регистрации от массового заведения ящиков (лимит, капча) — пока регистрация на публичной почте закрыта.
 - [ ] Письмо нескольким получателям: при ошибке на втором первый может получить его дважды (после повтора отправителя).
-- [ ] Своя настоящая почта: отдельная VPS, порт 25, PTR, отдельный домен (чек-лист Jambotron 75.6).
+- [ ] Настоящая почта (75.6): `docker-compose.public.yml` готов, первый запуск — `mail.jambocheck.com` на публичном адресе Horizon; адрес «прогревать» несколько недель, письма пользователям Jambotron пока через Resend (75.5).
 
 ## Лицензия
 

backend/Dockerfile

@@ -5,7 +5,7 @@
 # 1. Web client (Angular) — served by the backend from classpath:/static
 FROM node:22-bookworm-slim AS web
 WORKDIR /web
-COPY frontend/package*.json ./
+COPY frontend/package*.json frontend/.npmrc ./
 RUN npm install --no-audit --no-fund
 COPY frontend/ ./
 RUN npx ng build --configuration=production
@@ -24,11 +24,11 @@ RUN chmod +x gradlew && ./gradlew :backend:bootJar --no-daemon -x test
 FROM eclipse-temurin:21-jre
 # Ubuntu image, curl included; own user: "mail" already exists (uid 8)
 RUN groupadd -r -g 10001 app && useradd -r -u 10001 -g app -d /app -s /usr/sbin/nologin app \
-    && mkdir -p /app/data/attachments /app/data/dkim-keys && chown -R app:app /app/data
+    && mkdir -p /app/data/attachments /app/data/dkim-keys /app/data/tls && chown -R app:app /app/data
 WORKDIR /app
 COPY --from=build /app/backend/build/libs/*.jar app.jar
 USER app
-ENV MAIL_ATTACHMENTS_DIR=/app/data/attachments DKIM_KEYS_DIR=/app/data/dkim-keys
+ENV MAIL_ATTACHMENTS_DIR=/app/data/attachments DKIM_KEYS_DIR=/app/data/dkim-keys MAIL_PASSWORDS_FILE=/app/data/initial-passwords.txt MAIL_TLS_DIR=/app/data/tls
 EXPOSE 8080 3025
 HEALTHCHECK --interval=30s --timeout=5s --start-period=60s --retries=3 \
     CMD curl -fsS http://localhost:8080/actuator/health || exit 1

backend/src/main/java/com/mailserver/config/DataInitializer.java

@@ -9,12 +9,27 @@ import org.springframework.boot.CommandLineRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.nio.file.attribute.PosixFilePermissions;
 import java.security.SecureRandom;
+import java.time.Instant;
 import java.util.Base64;
+import java.util.Locale;
 
 /**
- * First mailbox on an empty database: {@code mailserver.admin.email} (default admin@<first domain>) with
- * {@code mailserver.admin.password}; no password given — a random one, printed to the log once.
+ * Mailboxes the server needs on start:
+ * <ul>
+ *   <li>the first mailbox on an empty database — {@code mailserver.admin.email} (default admin@&lt;first domain&gt;)
+ *       with {@code mailserver.admin.password};</li>
+ *   <li>the catch-all mailbox ({@code mailserver.catch-all}) if it does not exist yet — mail to unknown addresses is
+ *       stored there, so it must exist.</li>
+ * </ul>
+ * A generated password is printed to the log once (visible in Jambotron: project → Services → mail → Logs) and appended
+ * to {@code mailserver.passwords-file} (mode 600, in the data volume) — change it after the first login.
  */
 @Configuration
 public class DataInitializer {
@@ -24,23 +39,53 @@ public class DataInitializer {
     @Bean
     public CommandLineRunner initDatabase(UserService userService, UserRepository userRepository, MailDomains domains,
                                           @Value("${mailserver.admin.email:}") String email,
-                                          @Value("${mailserver.admin.password:}") String password) {
+                                          @Value("${mailserver.admin.password:}") String password,
+                                          @Value("${mailserver.passwords-file:}") String passwordsFile) {
         return args -> {
-            if (userRepository.count().block() > 0) {
-                return;
+            Path file = passwordsFile.isBlank() ? null : Path.of(passwordsFile);
+            if (userRepository.count().block() == 0) {
+                String address = email.isBlank() ? "admin@" + domains.domains().iterator().next() : email.trim().toLowerCase(Locale.ROOT);
+                create(userService, address, password, "Administrator", file);
             }
-            String address = email.isBlank() ? "admin@" + domains.domains().iterator().next() : email.trim().toLowerCase();
-            boolean generated = password.isBlank();
-            String secret = generated ? randomPassword() : password;
-            userService.register(address, secret, "Administrator").block();
-            if (generated) {
-                log.warn("First mailbox created: {} — password: {} (shown once, change it)", address, secret);
-            } else {
-                log.info("First mailbox created: {}", address);
+            String catchAll = domains.catchAll();
+            if (catchAll != null && !Boolean.TRUE.equals(userRepository.existsByEmail(catchAll).block())) {
+                create(userService, catchAll, "", "Mail trap", file);
             }
         };
     }
 
+    private static void create(UserService userService, String address, String password, String name, Path file)
+            throws IOException {
+        boolean generated = password.isBlank();
+        String secret = generated ? randomPassword() : password;
+        userService.register(address, secret, name).block();
+        if (!generated) {
+            log.info("Mailbox created: {}", address);
+        } else if (file != null) {
+            appendPassword(file, address, secret);
+            // also in the log: the owner sees it in Jambotron (project → Services → mail → Logs) without a shell
+            log.warn("Mailbox created: {} — password: {} (also in {}; change it)", address, secret, file);
+        } else {
+            log.warn("Mailbox created: {} — password: {} (shown once, change it)", address, secret);
+        }
+    }
+
+    static void appendPassword(Path file, String address, String password) throws IOException {
+        if (file.getParent() != null) {
+            Files.createDirectories(file.getParent());
+        }
+        if (!Files.exists(file)) {
+            Files.createFile(file);
+            try {
+                Files.setPosixFilePermissions(file, PosixFilePermissions.fromString("rw-------"));
+            } catch (UnsupportedOperationException ignored) {
+                // not a POSIX file system (Windows) — nothing to restrict
+            }
+        }
+        Files.writeString(file, Instant.now() + " " + address + " " + password + System.lineSeparator(),
+                StandardCharsets.UTF_8, StandardOpenOption.APPEND);
+    }
+
     private static String randomPassword() {
         byte[] bytes = new byte[18];
         new SecureRandom().nextBytes(bytes);

backend/src/main/java/com/mailserver/config/HttpsConfig.java

@@ -0,0 +1,81 @@
+package com.mailserver.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
+import org.springframework.context.SmartLifecycle;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.server.reactive.HttpHandler;
+import org.springframework.http.server.reactive.ReactorHttpHandlerAdapter;
+import reactor.netty.DisposableServer;
+import reactor.netty.http.server.HttpServer;
+
+import java.time.Duration;
+
+/**
+ * The web client and API over HTTPS on the mail host itself (mailserver.https.port, in public compose 8443 →
+ * published 443): https://mail.jambocheck.com opens the web mail, no second name through Jambotron's Caddy.
+ * Same certificate as SMTP/IMAP (Let's Encrypt from the acme service, reloaded when renewed). The plain HTTP port
+ * (8080) stays for a reverse proxy inside the network (staging: domain in Jambotron).
+ */
+@Configuration
+public class HttpsConfig {
+
+    @Bean
+    @ConditionalOnExpression("${mailserver.https.port:0} > 0 and ${mailserver.tls.enabled:true}")
+    public HttpsServer httpsServer(HttpHandler handler, MailServerConfig.SmtpTlsContext tls,
+                                   @Value("${mailserver.smtp.host:0.0.0.0}") String host,
+                                   @Value("${mailserver.https.port}") int port) {
+        return new HttpsServer(handler, tls, host, port);
+    }
+
+    public static class HttpsServer implements SmartLifecycle {
+
+        private static final Logger log = LoggerFactory.getLogger(HttpsServer.class);
+
+        private final HttpHandler handler;
+        private final MailServerConfig.SmtpTlsContext tls;
+        private final String host;
+        private final int port;
+        private volatile DisposableServer server;
+
+        HttpsServer(HttpHandler handler, MailServerConfig.SmtpTlsContext tls, String host, int port) {
+            this.handler = handler;
+            this.tls = tls;
+            this.host = host;
+            this.port = port;
+        }
+
+        @Override
+        public void start() {
+            server = HttpServer.create()
+                    .host(host)
+                    .port(port)
+                    .secure(spec -> spec.sslContext(tls.context()))
+                    // HSTS: Spring Security adds it for HTTPS requests by itself
+                    .handle(new ReactorHttpHandlerAdapter(handler))
+                    .bindNow(Duration.ofSeconds(30));
+            log.info("HTTPS (web client + API) listening on {}:{}", host, server.port());
+        }
+
+        @Override
+        public void stop() {
+            DisposableServer current = server;
+            if (current != null) {
+                current.disposeNow(Duration.ofSeconds(10));
+                server = null;
+            }
+        }
+
+        @Override
+        public boolean isRunning() {
+            return server != null;
+        }
+
+        public int port() {
+            return server == null ? -1 : server.port();
+        }
+    }
+}

backend/src/main/java/com/mailserver/config/ImapConfig.java

@@ -0,0 +1,60 @@
+package com.mailserver.config;
+
+import com.mailserver.security.LoginGuard;
+import com.mailserver.imap.DbImapStore;
+import com.mailserver.imap.ImapServer;
+import com.mailserver.imap.ImapStore;
+import com.mailserver.repository.AttachmentRepository;
+import com.mailserver.repository.MessageRepository;
+import com.mailserver.repository.UserRepository;
+import com.mailserver.service.MailService;
+import com.mailserver.service.MessageSources;
+import com.mailserver.service.UserService;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.util.unit.DataSize;
+
+import java.time.Duration;
+
+/** IMAP (75.2): STARTTLS on mailserver.imap.port, implicit TLS on mailserver.imaps.port when set. */
+@Configuration
+public class ImapConfig {
+
+    @Bean
+    public ImapStore imapStore(DatabaseClient db, UserRepository users, UserService userService, MailService mailService,
+                               MessageRepository messages, AttachmentRepository attachments, MessageSources sources,
+                               @Value("${mailserver.smtp.hostname:localhost}") String hostname) {
+        return new DbImapStore(db, users, userService, mailService, messages, attachments, sources, hostname);
+    }
+
+    @Bean(initMethod = "start", destroyMethod = "stop")
+    @ConditionalOnProperty(name = "mailserver.imap.enabled", havingValue = "true", matchIfMissing = true)
+    public ImapServer imapServer(ImapStore store, MailServerConfig.SmtpTlsContext tls, LoginGuard guard,
+                                 @Value("${mailserver.imap.host:0.0.0.0}") String host,
+                                 @Value("${mailserver.imap.port:3143}") int port,
+                                 @Value("${mailserver.smtp.hostname:localhost}") String hostname,
+                                 @Value("${mailserver.imap.auth-without-tls:false}") boolean authWithoutTls,
+                                 @Value("${mailserver.imap.max-literal:50MB}") DataSize maxLiteral,
+                                 @Value("${mailserver.imap.idle-timeout:30m}") Duration idleTimeout,
+                                 @Value("${mailserver.imap.idle-poll:5s}") Duration idlePoll) {
+        return new ImapServer(new ImapServer.Settings(host, port, hostname, authWithoutTls, tls.context(), false,
+                (int) maxLiteral.toBytes(), idleTimeout, idlePoll), store, guard);
+    }
+
+    @Bean(initMethod = "start", destroyMethod = "stop")
+    @ConditionalOnExpression("'${mailserver.imap.enabled:true}' == 'true' and ${mailserver.imaps.port:0} > 0 and ${mailserver.tls.enabled:true}")
+    public ImapServer imapsServer(ImapStore store, MailServerConfig.SmtpTlsContext tls, LoginGuard guard,
+                                  @Value("${mailserver.imap.host:0.0.0.0}") String host,
+                                  @Value("${mailserver.imaps.port}") int port,
+                                  @Value("${mailserver.smtp.hostname:localhost}") String hostname,
+                                  @Value("${mailserver.imap.max-literal:50MB}") DataSize maxLiteral,
+                                  @Value("${mailserver.imap.idle-timeout:30m}") Duration idleTimeout,
+                                  @Value("${mailserver.imap.idle-poll:5s}") Duration idlePoll) {
+        return new ImapServer(new ImapServer.Settings(host, port, hostname, false, tls.context(), true,
+                (int) maxLiteral.toBytes(), idleTimeout, idlePoll), store, guard);
+    }
+}

backend/src/main/java/com/mailserver/config/ImapServerConfig.java

@@ -1,580 +0,0 @@
-package com.mailserver.config;
-
-import com.mailserver.repository.FolderRepository;
-import com.mailserver.repository.MessageRepository;
-import com.mailserver.repository.UserRepository;
-import com.mailserver.service.UserService;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.context.annotation.Configuration;
-
-import jakarta.annotation.PostConstruct;
-import jakarta.annotation.PreDestroy;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.PrintWriter;
-import java.net.ServerSocket;
-import java.net.Socket;
-import java.nio.charset.StandardCharsets;
-import java.time.Instant;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
-
-/**
- * Встроенный IMAP-сервер для почтового сервера.
- * Поддерживает основные команды IMAP4rev1: LOGIN, SELECT, FETCH, SEARCH, STORE, EXPUNGE, LOGOUT.
- * Запускается при старте приложения и останавливается при завершении.
- */
-@Configuration
-public class ImapServerConfig {
-
-    private static final Logger log = LoggerFactory.getLogger(ImapServerConfig.class);
-
-    @Value("${mailserver.imap.enabled:true}")
-    private boolean enabled;
-
-    @Value("${mailserver.imap.port:143}")
-    private int port;
-
-    @Value("${mailserver.imap.hostname:localhost}")
-    private String hostname;
-
-    private final UserRepository userRepository;
-    private final FolderRepository folderRepository;
-    private final MessageRepository messageRepository;
-    private final UserService userService;
-
-    private ServerSocket serverSocket;
-    private ExecutorService executorService;
-
-    public ImapServerConfig(UserRepository userRepository, FolderRepository folderRepository,
-                           MessageRepository messageRepository, UserService userService) {
-        this.userRepository = userRepository;
-        this.folderRepository = folderRepository;
-        this.messageRepository = messageRepository;
-        this.userService = userService;
-    }
-
-    @PostConstruct
-    public void start() {
-        if (!enabled) {
-            log.info("IMAP-сервер отключён (mailserver.imap.enabled=false)");
-            return;
-        }
-
-        executorService = Executors.newCachedThreadPool();
-
-        try {
-            serverSocket = new ServerSocket(port);
-            log.info("IMAP-сервер запущен на порту {} (хост: {})", port, hostname);
-
-            // Принимаем подключения в цикле
-            while (!serverSocket.isClosed()) {
-                try {
-                    Socket clientSocket = serverSocket.accept();
-                    executorService.submit(() -> handleClient(clientSocket));
-                } catch (IOException e) {
-                    if (!serverSocket.isClosed()) {
-                        log.error("Ошибка при принятии подключения", e);
-                    }
-                }
-            }
-        } catch (IOException e) {
-            if (serverSocket == null || !serverSocket.isClosed()) {
-                log.error("Не удалось запустить IMAP-сервер на порту {}", port, e);
-            }
-        }
-    }
-
-    @PreDestroy
-    public void stop() {
-        log.info("Остановка IMAP-сервера...");
-        try {
-            if (serverSocket != null && !serverSocket.isClosed()) {
-                serverSocket.close();
-            }
-        } catch (IOException e) {
-            log.error("Ошибка при остановке IMAP-сервера", e);
-        }
-
-        if (executorService != null) {
-            executorService.shutdown();
-            try {
-                if (!executorService.awaitTermination(5, TimeUnit.SECONDS)) {
-                    executorService.shutdownNow();
-                }
-            } catch (InterruptedException e) {
-                executorService.shutdownNow();
-                Thread.currentThread().interrupt();
-            }
-        }
-        log.info("IMAP-сервер остановлен");
-    }
-
-    private void handleClient(Socket socket) {
-        String clientAddress = socket.getInetAddress().getHostAddress();
-        log.info("Новое IMAP-подключение от {}", clientAddress);
-
-        try (socket;
-             PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
-             BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(), StandardCharsets.UTF_8))) {
-
-            // Отправляем приветствие
-            out.println("* OK IMAP4rev1 Server Ready");
-
-            String username = null;
-            String line;
-
-            while (username == null && (line = in.readLine()) != null) {
-                String[] parts = parseCommand(line);
-                if (parts == null) continue;
-
-                String tag = parts[0];
-                String command = parts[1].toUpperCase();
-
-                switch (command) {
-                    case "LOGIN" -> {
-                        if (parts.length >= 4) {
-                            String email = parts[2].toLowerCase();
-                            String password = parts[3];
-
-                            // Проверяем пароль через BCrypt
-                            com.mailserver.domain.User user = userRepository.findByEmail(email).block();
-                            if (user != null && userService.checkPassword(user, password)) {
-                                username = email;
-                                out.println(tag + " OK LOGIN completed");
-                                log.info("Пользователь {} успешно авторизован через IMAP", email);
-                            } else {
-                                out.println(tag + " NO LOGIN failed: invalid credentials");
-                                log.warn("Неудачная попытка IMAP-авторизации для пользователя {}", email);
-                            }
-                        } else {
-                            out.println(tag + " BAD Invalid LOGIN command");
-                        }
-                    }
-                    case "CAPABILITY" -> {
-                        out.println("* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE LITERAL+");
-                        out.println(tag + " OK Capability completed");
-                    }
-                    case "LOGOUT" -> {
-                        out.println("* BYE IMAP4rev1 server terminating");
-                        out.println(tag + " OK LOGOUT completed");
-                        return;
-                    }
-                    default -> {
-                        if (username == null) {
-                            out.println(tag + " BAD Authentication required");
-                        } else {
-                            handleAuthenticatedCommand(tag, command, parts, username, out, in);
-                        }
-                    }
-                }
-            }
-        } catch (IOException e) {
-            log.error("Ошибка при обработке IMAP-подключения от {}", clientAddress, e);
-        } finally {
-            log.info("IMAP-подключение от {} закрыто", clientAddress);
-        }
-    }
-
-    private void handleAuthenticatedCommand(String tag, String command, String[] parts,
-                                           String username, PrintWriter out, BufferedReader in) {
-        switch (command) {
-            case "SELECT" -> handleSelect(tag, parts, username, out);
-            case "EXAMINE" -> handleSelect(tag, parts, username, out); // EXAMINE = SELECT в read-only режиме
-            case "FETCH" -> handleFetch(tag, parts, username, out);
-            case "SEARCH" -> handleSearch(tag, parts, username, out);
-            case "STORE" -> handleStore(tag, parts, username, out);
-            case "EXPUNGE" -> handleExpunge(tag, username, out);
-            case "LIST" -> handleList(tag, username, out);
-            case "LSUB" -> handleList(tag, username, out); // LSUB = LIST для подписок
-            case "STATUS" -> handleStatus(tag, parts, username, out);
-            case "ID" -> {
-                out.println("* ID (\"name\" \"MailServer IMAP\" \"version\" \"1.0\")");
-                out.println(tag + " OK ID completed");
-            }
-            default -> {
-                out.println(tag + " BAD Unknown command: " + command);
-            }
-        }
-    }
-
-    private void handleSelect(String tag, String[] parts, String username, PrintWriter out) {
-        if (parts.length < 3) {
-            out.println(tag + " BAD Invalid SELECT command");
-            return;
-        }
-
-        String folderName = parts[2].replace("\"", "");
-        com.mailserver.domain.User userTemp = userRepository.findByEmail(username).block();
-        if (userTemp == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-        com.mailserver.domain.Folder folder = folderRepository.findByUserIdAndName(
-                userTemp.getId(), folderName).block();
-
-        if (folder == null) {
-            out.println(tag + " NO [NONEXISTENT] Mailbox does not exist");
-            return;
-        }
-
-        long messageCount = messageRepository.findByFolderId(folder.getId(),
-                org.springframework.data.domain.PageRequest.of(0, 1)).count().block();
-
-        out.println("* " + messageCount + " EXISTS");
-        out.println("* 0 RECENT");
-        out.println("* FLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft)");
-        out.println(tag + " [OK] [UNSEEN 1] " + (messageCount > 0 ? "There are unseen messages in the mailbox." : "The mailbox has no unseen messages."));
-        out.println(tag + " OK [READ-WRITE] SELECT completed");
-    }
-
-    private void handleFetch(String tag, String[] parts, String username, PrintWriter out) {
-        if (parts.length < 4) {
-            out.println(tag + " BAD Invalid FETCH command");
-            return;
-        }
-
-        String messageId = parts[2];
-        String item = parts[3];
-
-        com.mailserver.domain.User user = userRepository.findByEmail(username).block();
-        if (user == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-
-        // Получаем все сообщения пользователя
-        java.util.List<com.mailserver.domain.Folder> folders = folderRepository.findByUserId(user.getId()).collectList().block();
-        java.util.List<com.mailserver.domain.Message> allMessages = new java.util.ArrayList<>();
-        for (com.mailserver.domain.Folder folder : folders) {
-            allMessages.addAll(messageRepository.findByFolderId(folder.getId(),
-                    org.springframework.data.domain.PageRequest.of(0, 1000)).collectList().block());
-        }
-
-        // Находим сообщение по UID или индексу
-        com.mailserver.domain.Message message = null;
-        if (item.contains("UID")) {
-            // UID FETCH
-            try {
-                long uid = Long.parseLong(messageId);
-                for (com.mailserver.domain.Message msg : allMessages) {
-                    if (msg.getId().equals(uid)) {
-                        message = msg;
-                        break;
-                    }
-                }
-            } catch (NumberFormatException e) {
-                out.println(tag + " BAD Invalid UID");
-                return;
-            }
-        } else {
-            // FETCH по индексу (1-based)
-            try {
-                int index = Integer.parseInt(messageId) - 1;
-                if (index >= 0 && index < allMessages.size()) {
-                    message = allMessages.get(index);
-                }
-            } catch (NumberFormatException e) {
-                out.println(tag + " BAD Invalid message set");
-                return;
-            }
-        }
-
-        if (message == null) {
-            out.println(tag + " NO Message not found");
-            return;
-        }
-
-        // Формируем ответ FETCH
-        StringBuilder flags = new StringBuilder();
-        if (message.isRead()) flags.append("\\Seen ");
-        if (message.isFlagged()) flags.append("\\Flagged ");
-        if (message.isSpam()) flags.append("\\Deleted ");
-        if (message.getBody() != null && !message.getBody().isEmpty()) flags.append("\\Answered ");
-
-        out.println("* " + messageId + " FETCH (");
-        out.println("  UID " + message.getId());
-        out.println("  FLAGS (" + flags.toString().trim() + ")");
-        out.println("  INTERNALDATE \"" + formatImapDate(message.getReceivedAt()) + "\"");
-        out.println("  RFC822.SIZE " + (message.getMessageSize() != null ? message.getMessageSize() : 0));
-        out.println("  ENVELOPE (");
-        out.println("    \"" + escapeString(message.getReceivedAt() != null ? message.getReceivedAt().toString() : "") + "\"");
-        out.println("    \"" + escapeString(message.getSubject() != null ? message.getSubject() : "") + "\"");
-        out.println("    (\"" + escapeString(message.getSenderName() != null ? message.getSenderName() : "") + "\" 0 \"\" \"" + escapeString(message.getSenderEmail() != null ? message.getSenderEmail() : "") + "\")");
-        out.println("    (\"" + escapeString(message.getRecipientEmail() != null ? message.getRecipientEmail() : "") + "\")");
-        out.println("    (\"" + escapeString(message.getRecipientEmail() != null ? message.getRecipientEmail() : "") + "\")");
-        out.println("    (\"" + escapeString(message.getSenderEmail() != null ? message.getSenderEmail() : "") + "\")");
-        out.println("    NIL");
-        out.println("    NIL");
-        out.println("    NIL");
-        out.println("  )");
-
-        // Если запрошено тело сообщения
-        if (item.contains("BODY[]") || item.contains("RFC822")) {
-            out.println("  BODY[] {");
-            String body = message.getBody() != null ? message.getBody() : "";
-            out.println(body.length());
-            out.println(body);
-            out.println(")");
-        }
-
-        out.println(")");
-        out.println(tag + " OK FETCH completed");
-    }
-
-    private void handleSearch(String tag, String[] parts, String username, PrintWriter out) {
-        com.mailserver.domain.User user = userRepository.findByEmail(username).block();
-        if (user == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-
-        com.mailserver.domain.Folder inbox = folderRepository.findByUserIdAndName(user.getId(), "INBOX").block();
-        if (inbox == null) {
-            out.println(tag + " OK SEARCH completed");
-            return;
-        }
-
-        // Простой поиск по ключевому слову
-        String keyword = null;
-        for (int i = 2; i < parts.length; i++) {
-            if (!parts[i].equals("ALL") && !parts[i].equals("FROM") && !parts[i].equals("SUBJECT") && !parts[i].equals("BODY")) {
-                keyword = parts[i];
-                break;
-            }
-        }
-
-        java.util.List<Long> messageIds;
-        if (keyword != null && !keyword.isEmpty()) {
-            var results = messageRepository.searchInFolder(inbox.getId(), keyword,
-                    org.springframework.data.domain.PageRequest.of(0, 100)).collectList().block();
-            messageIds = results.stream()
-                    .map(com.mailserver.domain.Message::getId)
-                    .collect(java.util.stream.Collectors.toList());
-        } else {
-            var results = messageRepository.findByFolderId(inbox.getId(),
-                    org.springframework.data.domain.PageRequest.of(0, 100)).collectList().block();
-            messageIds = results.stream()
-                    .map(com.mailserver.domain.Message::getId)
-                    .collect(java.util.stream.Collectors.toList());
-        }
-
-        StringBuilder ids = new StringBuilder();
-        for (Long id : messageIds) {
-            ids.append(id).append(" ");
-        }
-
-        out.println("* SEARCH " + ids.toString().trim());
-        out.println(tag + " OK SEARCH completed");
-    }
-
-    private void handleStore(String tag, String[] parts, String username, PrintWriter out) {
-        if (parts.length < 5) {
-            out.println(tag + " BAD Invalid STORE command");
-            return;
-        }
-
-        String messageId = parts[2];
-        String item = parts[3].toUpperCase();
-        String value = parts[4].toUpperCase();
-
-        com.mailserver.domain.User user = userRepository.findByEmail(username).block();
-        if (user == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-
-        // Получаем все сообщения пользователя
-        java.util.List<com.mailserver.domain.Folder> folders = folderRepository.findByUserId(user.getId()).collectList().block();
-        java.util.List<com.mailserver.domain.Message> allMessages = new java.util.ArrayList<>();
-        for (com.mailserver.domain.Folder folder : folders) {
-            allMessages.addAll(messageRepository.findByFolderId(folder.getId(),
-                    org.springframework.data.domain.PageRequest.of(0, 1000)).collectList().block());
-        }
-
-        com.mailserver.domain.Message message = null;
-        try {
-            int index = Integer.parseInt(messageId) - 1;
-            if (index >= 0 && index < allMessages.size()) {
-                message = allMessages.get(index);
-            }
-        } catch (NumberFormatException e) {
-            out.println(tag + " BAD Invalid message set");
-            return;
-        }
-
-        if (message == null) {
-            out.println(tag + " NO Message not found");
-            return;
-        }
-
-        boolean saved = false;
-        if (item.contains("+FLAGS") || item.contains("FLAGS")) {
-            if (value.contains("\\SEEN")) {
-                message.setRead(true);
-                saved = true;
-            }
-            if (value.contains("\\FLAGGED")) {
-                message.setFlagged(true);
-                saved = true;
-            }
-            if (value.contains("\\DELETED")) {
-                message.setSpam(true); // Используем spam как флаг удаления для IMAP
-                saved = true;
-            }
-        }
-
-        if (item.contains("-FLAGS")) {
-            if (value.contains("\\SEEN")) {
-                message.setRead(false);
-                saved = true;
-            }
-            if (value.contains("\\FLAGGED")) {
-                message.setFlagged(false);
-                saved = true;
-            }
-        }
-
-        if (saved) {
-            messageRepository.save(message).block();
-        }
-
-        out.println("* " + messageId + " FETCH (FLAGS (" + formatFlags(message) + "))");
-        out.println(tag + " OK STORE completed");
-    }
-
-    private void handleExpunge(String tag, String username, PrintWriter out) {
-        com.mailserver.domain.User user = userRepository.findByEmail(username).block();
-        if (user == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-
-        java.util.List<com.mailserver.domain.Folder> folders = folderRepository.findByUserId(user.getId()).collectList().block();
-        for (com.mailserver.domain.Folder folder : folders) {
-            var messages = messageRepository.findByFolderId(folder.getId(),
-                    org.springframework.data.domain.PageRequest.of(0, 1000)).collectList().block();
-            for (com.mailserver.domain.Message message : messages) {
-                if (message.isSpam()) {
-                    messageRepository.delete(message).block();
-                    folder.setMessageCount(Math.max(0, folder.getMessageCount() - 1));
-                    folderRepository.save(folder).block();
-                }
-            }
-        }
-
-        out.println("* 0 EXPUNGE");
-        out.println(tag + " OK EXPUNGE completed");
-    }
-
-    private void handleList(String tag, String username, PrintWriter out) {
-        com.mailserver.domain.User user = userRepository.findByEmail(username).block();
-        if (user == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-
-        java.util.List<com.mailserver.domain.Folder> folders = folderRepository.findByUserId(user.getId()).collectList().block();
-        for (com.mailserver.domain.Folder folder : folders) {
-            out.println("* LIST (\\HasNoChildren) \".\" \"" + folder.getName() + "\"");
-        }
-
-        out.println(tag + " OK LIST completed");
-    }
-
-    private void handleStatus(String tag, String[] parts, String username, PrintWriter out) {
-        if (parts.length < 4) {
-            out.println(tag + " BAD Invalid STATUS command");
-            return;
-        }
-
-        String folderName = parts[2].replace("\"", "");
-        com.mailserver.domain.User user = userRepository.findByEmail(username).block();
-        if (user == null) {
-            out.println(tag + " NO User not found");
-            return;
-        }
-
-        com.mailserver.domain.Folder folder = folderRepository.findByUserIdAndName(user.getId(), folderName).block();
-        if (folder == null) {
-            out.println(tag + " NO [NONEXISTENT] Mailbox does not exist");
-            return;
-        }
-
-        long messageCount = messageRepository.findByFolderId(folder.getId(),
-                org.springframework.data.domain.PageRequest.of(0, 1)).count().block();
-        long unreadCount = messageRepository.countUnreadByFolderId(folder.getId()).block();
-
-        out.println("* STATUS " + folderName + " (MESSAGES " + messageCount + " UNSEEN " + unreadCount + " UIDNEXT " + (messageCount + 1) + " UIDVALIDITY 1)");
-        out.println(tag + " OK STATUS completed");
-    }
-
-    private String[] parseCommand(String line) {
-        if (line == null || line.trim().isEmpty()) return null;
-
-        line = line.trim();
-        int spaceIndex = line.indexOf(' ');
-        if (spaceIndex == -1) return new String[]{line, ""};
-
-        String tag = line.substring(0, spaceIndex);
-        String rest = line.substring(spaceIndex + 1).trim();
-
-        // Разбираем команду и аргументы
-        String[] parts = new String[20]; // Максимум 20 аргументов
-        parts[0] = tag;
-        int index = 1;
-
-        int i = 0;
-        while (i < rest.length() && index < parts.length) {
-            if (rest.charAt(i) == '"') {
-                // Строка в кавычках
-                int end = rest.indexOf('"', i + 1);
-                if (end == -1) break;
-                parts[index++] = rest.substring(i + 1, end);
-                i = end + 1;
-            } else if (Character.isWhitespace(rest.charAt(i))) {
-                i++;
-            } else {
-                int end = rest.indexOf(' ', i);
-                if (end == -1) end = rest.length();
-                parts[index++] = rest.substring(i, end);
-                i = end;
-            }
-        }
-
-        // Обрезаем массив до нужного размера
-        String[] result = new String[index];
-        System.arraycopy(parts, 0, result, 0, index);
-        return result;
-    }
-
-    private String formatImapDate(Instant instant) {
-        if (instant == null) return "";
-        // Формат IMAP: "dd-MMM-yyyy hh:mm:ss +0000"
-        String[] months = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
-                           "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-        java.time.LocalDate date = instant.atZone(java.time.ZoneOffset.UTC).toLocalDate();
-        java.time.LocalTime time = instant.atZone(java.time.ZoneOffset.UTC).toLocalTime();
-
-        return String.format("%02d-%s-%04d %02d:%02d:%02d +0000",
-                date.getDayOfMonth(), months[date.getMonthValue() - 1], date.getYear(),
-                time.getHour(), time.getMinute(), time.getSecond());
-    }
-
-    private String escapeString(String str) {
-        if (str == null) return "";
-        return str.replace("\\", "\\\\").replace("\"", "\\\"");
-    }
-
-    private String formatFlags(com.mailserver.domain.Message message) {
-        StringBuilder flags = new StringBuilder();
-        if (message.isRead()) flags.append("\\Seen ");
-        if (message.isFlagged()) flags.append("\\Flagged ");
-        if (message.isSpam()) flags.append("\\Deleted ");
-        return flags.toString().trim();
-    }
-}

backend/src/main/java/com/mailserver/config/LoginGuardConfig.java

@@ -0,0 +1,74 @@
+package com.mailserver.config;
+
+import com.mailserver.security.LoginGuard;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.web.server.adapter.ForwardedHeaderTransformer;
+
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/** Brute-force protection (one guard for SMTP, IMAP and the web) and whose X-Forwarded-* headers to believe. */
+@Configuration
+public class LoginGuardConfig {
+
+    @Bean
+    public LoginGuard loginGuard(@Value("${mailserver.login-guard.enabled:true}") boolean enabled,
+                                 @Value("${mailserver.login-guard.max-per-ip:10}") int maxPerIp,
+                                 @Value("${mailserver.login-guard.max-per-account:20}") int maxPerAccount,
+                                 @Value("${mailserver.login-guard.window:15m}") Duration window,
+                                 @Value("${mailserver.login-guard.block:15m}") Duration block,
+                                 @Value("${mailserver.login-guard.max-block:24h}") Duration maxBlock,
+                                 @Value("${mailserver.login-guard.known-ip-ttl:30d}") Duration knownIpTtl,
+                                 @Value("${mailserver.login-guard.trusted-ips:}") String trustedIps,
+                                 @Value("${mailserver.login-guard.failure-delay:1s}") Duration failureDelay) {
+        Set<String> trusted = Arrays.stream(trustedIps.split(","))
+                .map(String::trim).filter(s -> !s.isEmpty()).collect(Collectors.toUnmodifiableSet());
+        return new LoginGuard(new LoginGuard.Settings(enabled, maxPerIp, maxPerAccount, window, block, maxBlock,
+                knownIpTtl, trusted, failureDelay));
+    }
+
+    /**
+     * Replaces Boot's transformer (server.forward-headers-strategy=framework): X-Forwarded-* / Forwarded are believed
+     * only from a proxy in a private network (Jambotron's Caddy comes over the docker network / WireGuard). A request
+     * straight from the internet (the VM's public address) has them removed — otherwise anyone could put a new
+     * X-Forwarded-For into every login attempt and never hit the per-IP limit.
+     */
+    @Bean(name = "forwardedHeaderTransformer")
+    public ForwardedHeaderTransformer forwardedHeaderTransformer() {
+        return new TrustedProxyHeaderTransformer();
+    }
+
+    static final class TrustedProxyHeaderTransformer extends ForwardedHeaderTransformer {
+
+        private final ForwardedHeaderTransformer stripOnly = new ForwardedHeaderTransformer();
+
+        TrustedProxyHeaderTransformer() {
+            stripOnly.setRemoveOnly(true);
+        }
+
+        @Override
+        public ServerHttpRequest apply(ServerHttpRequest request) {
+            return privatePeer(request.getRemoteAddress()) ? super.apply(request) : stripOnly.apply(request);
+        }
+    }
+
+    /** Loopback, 10/8, 172.16/12, 192.168/16, link-local, IPv6 fc00::/7. */
+    static boolean privatePeer(InetSocketAddress peer) {
+        if (peer == null || peer.getAddress() == null) {
+            return false;
+        }
+        InetAddress a = peer.getAddress();
+        if (a.isLoopbackAddress() || a.isSiteLocalAddress() || a.isLinkLocalAddress()) {
+            return true;
+        }
+        byte[] b = a.getAddress();
+        return b.length == 16 && (b[0] & 0xfe) == 0xfc;
+    }
+}

backend/src/main/java/com/mailserver/config/MailAdmins.java

@@ -0,0 +1,36 @@
+package com.mailserver.config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import java.util.Arrays;
+import java.util.Locale;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Who manages mailboxes (Settings → Mailboxes): {@code mailserver.admins} (comma separated), by default the first
+ * mailbox — {@code mailserver.admin.email}, or admin@<first domain>. No role in the database: the list lives in
+ * the configuration, so a stolen mailbox can not make itself an administrator.
+ */
+@Component
+public class MailAdmins {
+
+    private final Set<String> admins;
+
+    public MailAdmins(@Value("${mailserver.admins:}") String admins,
+                      @Value("${mailserver.admin.email:}") String firstMailbox,
+                      MailDomains domains) {
+        String list = !admins.isBlank() ? admins
+                : !firstMailbox.isBlank() ? firstMailbox
+                : "admin@" + domains.domains().iterator().next();
+        this.admins = Arrays.stream(list.split(","))
+                .map(a -> a.trim().toLowerCase(Locale.ROOT))
+                .filter(a -> !a.isEmpty())
+                .collect(Collectors.toUnmodifiableSet());
+    }
+
+    public boolean isAdmin(String email) {
+        return email != null && admins.contains(email.toLowerCase(Locale.ROOT));
+    }
+}

backend/src/main/java/com/mailserver/config/MailServerConfig.java

@@ -1,14 +1,19 @@
 package com.mailserver.config;
 
+import com.mailserver.security.LoginGuard;
 import com.mailserver.delivery.SmtpDeliveryClient;
 import com.mailserver.smtp.MailRouter;
 import com.mailserver.smtp.SmtpServer;
+import com.mailserver.smtp.SmtpTls;
+import io.netty.handler.ssl.SslContext;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
+import java.nio.file.Path;
 import java.time.Duration;
 import java.util.Locale;
 
@@ -17,16 +22,46 @@ import java.util.Locale;
 @EnableScheduling
 public class MailServerConfig {
 
+    /**
+     * Certificate for SMTP TLS: mailserver.tls.cert-file + key-file (PEM), or a self-signed one in mailserver.tls.dir.
+     * mailserver.tls.enabled=false — no TLS at all.
+     */
+    @Bean
+    public SmtpTlsContext smtpTlsContext(@Value("${mailserver.tls.enabled:true}") boolean enabled,
+                                         @Value("${mailserver.tls.cert-file:}") String certFile,
+                                         @Value("${mailserver.tls.key-file:}") String keyFile,
+                                         @Value("${mailserver.tls.dir:./tls}") String dir,
+                                         @Value("${mailserver.smtp.hostname:localhost}") String hostname) throws Exception {
+        return new SmtpTlsContext(enabled ? SmtpTls.serverContext(certFile, keyFile, Path.of(dir), hostname) : null);
+    }
+
+    public record SmtpTlsContext(SslContext context) {
+    }
+
     @Bean(initMethod = "start", destroyMethod = "stop")
     @ConditionalOnProperty(name = "mailserver.smtp.enabled", havingValue = "true", matchIfMissing = true)
-    public SmtpServer smtpServer(MailRouter router,
+    public SmtpServer smtpServer(MailRouter router, SmtpTlsContext tls, LoginGuard guard,
                                  @Value("${mailserver.smtp.host:0.0.0.0}") String host,
                                  @Value("${mailserver.smtp.port:3025}") int port,
                                  @Value("${mailserver.smtp.hostname:localhost}") String hostname,
                                  @Value("${mailserver.smtp.max-message-bytes:26214400}") long maxBytes,
                                  @Value("${mailserver.smtp.auth-without-tls:false}") boolean authWithoutTls,
                                  @Value("${mailserver.smtp.idle-timeout:5m}") Duration idleTimeout) {
-        return new SmtpServer(new SmtpServer.Settings(host, port, hostname, maxBytes, authWithoutTls, idleTimeout), router);
+        return new SmtpServer(new SmtpServer.Settings(host, port, hostname, maxBytes, authWithoutTls, idleTimeout,
+                tls.context(), false), router, guard);
+    }
+
+    /** Implicit TLS (RFC 8314, usually port 465) — only when mailserver.smtps.port is set and TLS is on. */
+    @Bean(initMethod = "start", destroyMethod = "stop")
+    @ConditionalOnExpression("${mailserver.smtps.port:0} > 0 and ${mailserver.tls.enabled:true}")
+    public SmtpServer smtpsServer(MailRouter router, SmtpTlsContext tls, LoginGuard guard,
+                                  @Value("${mailserver.smtp.host:0.0.0.0}") String host,
+                                  @Value("${mailserver.smtps.port}") int port,
+                                  @Value("${mailserver.smtp.hostname:localhost}") String hostname,
+                                  @Value("${mailserver.smtp.max-message-bytes:26214400}") long maxBytes,
+                                  @Value("${mailserver.smtp.idle-timeout:5m}") Duration idleTimeout) {
+        return new SmtpServer(new SmtpServer.Settings(host, port, hostname, maxBytes, false, idleTimeout,
+                tls.context(), true), router, guard);
     }
 
     /**

backend/src/main/java/com/mailserver/config/SecurityConfig.java

@@ -51,7 +51,7 @@ public class SecurityConfig {
             .exceptionHandling(e -> e.authenticationEntryPoint(new HttpStatusServerEntryPoint(HttpStatus.UNAUTHORIZED)))
             .cors(cors -> cors.configurationSource(corsConfigurationSource()))
             .authorizeExchange(exchange -> exchange
-                .pathMatchers("/api/login", "/api/register", "/actuator/health").permitAll()
+                .pathMatchers("/api/login", "/api/register", "/api/config", "/actuator/health").permitAll()
                 .pathMatchers("/api/**", "/actuator/**").authenticated()
                 // the web client (static files, SPA routes)
                 .anyExchange().permitAll()

backend/src/main/java/com/mailserver/config/SpaWebFilter.java

@@ -7,7 +7,10 @@ import org.springframework.web.server.WebFilter;
 import org.springframework.web.server.WebFilterChain;
 import reactor.core.publisher.Mono;
 
-/** Angular routes (/inbox, /message/5, …) are pages of the web client: serve index.html for them. */
+/**
+ * Angular routes (/inbox, /message/5, /compose;to=a@b.c …) are pages of the web client: serve index.html for them.
+ * A last segment with a dot (before matrix parameters) is a file.
+ */
 @Component
 @Order(-100)
 public class SpaWebFilter implements WebFilter {
@@ -17,7 +20,7 @@ public class SpaWebFilter implements WebFilter {
         String path = exchange.getRequest().getPath().pathWithinApplication().value();
         boolean page = exchange.getRequest().getMethod().matches("GET")
                 && !path.startsWith("/api") && !path.startsWith("/actuator")
-                && !path.equals("/") && !path.substring(path.lastIndexOf('/') + 1).contains(".");
+                && !path.equals("/") && !path.substring(path.lastIndexOf('/') + 1).split(";")[0].contains(".");
         if (page) {
             return chain.filter(exchange.mutate().request(exchange.getRequest().mutate().path("/index.html").build()).build());
         }

backend/src/main/java/com/mailserver/controller/AuthenticationController.java

@@ -1,53 +1,202 @@
 package com.mailserver.controller;
 
+import com.mailserver.config.MailAdmins;
+import com.mailserver.config.MailDomains;
+import com.mailserver.domain.User;
 import com.mailserver.dto.LoginRequest;
 import com.mailserver.dto.LoginResponse;
-import com.mailserver.domain.User;
+import com.mailserver.dto.PasswordChangeRequest;
+import com.mailserver.dto.ProfileResponse;
+import com.mailserver.dto.ProfileUpdateRequest;
+import com.mailserver.dto.RegisterRequest;
+import com.mailserver.service.MailService;
 import com.mailserver.service.UserService;
+import com.mailserver.security.LoginGuard;
 import com.mailserver.util.JwtUtils;
 import jakarta.validation.Valid;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
 import reactor.core.publisher.Mono;
 
+import java.net.InetSocketAddress;
+import java.time.Duration;
+import java.util.Locale;
 import java.util.Map;
+import java.util.Set;
 
+/** Login, registration, the logged-in user's profile and password; what the login page needs to know. */
 @RestController
 @RequestMapping("/api")
 public class AuthenticationController {
 
-    private final UserService userService;
-    private final JwtUtils jwtUtils;
+    private static final Logger log = LoggerFactory.getLogger(AuthenticationController.class);
+    /** Marker for "no such mailbox or wrong password": both look the same from outside. */
+    private static final User NO_USER = new User();
 
-    public AuthenticationController(UserService userService, JwtUtils jwtUtils) {
+    /** Service addresses nobody can register (RFC 2142 and ours). */
+    static final Set<String> RESERVED = Set.of("postmaster", "abuse", "mailer-daemon", "hostmaster", "webmaster",
+            "root", "admin", "noreply", "no-reply", "security", "support");
+
+    private final UserService userService;
+    private final MailService mailService;
+    private final JwtUtils jwtUtils;
+    private final MailDomains domains;
+    private final boolean registrationEnabled;
+    private final LoginGuard guard;
+    private final MailAdmins admins;
+
+    public AuthenticationController(UserService userService, MailService mailService, JwtUtils jwtUtils, MailDomains domains,
+                                    @Value("${mailserver.registration.enabled:false}") boolean registrationEnabled,
+                                    LoginGuard guard, MailAdmins admins) {
+        this.guard = guard;
+        this.admins = admins;
         this.userService = userService;
+        this.mailService = mailService;
         this.jwtUtils = jwtUtils;
+        this.domains = domains;
+        this.registrationEnabled = registrationEnabled;
+    }
+
+    /** Public: is registration open, and in which domains mailboxes can be created. */
+    @GetMapping("/config")
+    public Map<String, Object> config() {
+        return Map.of("registrationEnabled", registrationEnabled, "domains", domains.domains().stream().sorted().toList());
     }
 
     @PostMapping("/login")
-    public Mono<ResponseEntity<?>> login(@Valid @RequestBody Mono<LoginRequest> requestMono) {
-        return requestMono.flatMap(request ->
-            userService.findByEmail(request.getEmail())
-                .switchIfEmpty(Mono.error(new IllegalArgumentException("Invalid credentials")))
+    public Mono<ResponseEntity<?>> login(@Valid @RequestBody Mono<LoginRequest> requestMono, ServerHttpRequest http) {
+        String ip = clientIp(http);
+        return requestMono.flatMap(request -> {
+            String email = request.getEmail().trim().toLowerCase(Locale.ROOT);
+            Duration wait = guard.retryAfter(ip, email);
+            if (!wait.isZero()) {
+                log.warn("WEB {}: login as {} refused, blocked for {}", ip, email, LoginGuard.human(wait));
+                return Mono.just(tooMany(wait));
+            }
+            return userService.findByEmail(email)
+                .map(user -> userService.checkPassword(user, request.getPassword()) ? user : NO_USER)
+                .onErrorResume(IllegalArgumentException.class, e -> Mono.just(NO_USER))
+                .defaultIfEmpty(NO_USER)
                 .flatMap(user -> {
+                    if (user == NO_USER) {
+                        guard.failure(ip, email);
+                        log.warn("WEB {}: authentication failed for {}", ip, email);
+                        Mono<ResponseEntity<?>> answer = Mono.just(ResponseEntity.badRequest().body(Map.of("error", "Invalid credentials")));
+                        Duration delay = guard.failureDelay();
+                        return delay.isZero() ? answer : answer.delayElement(delay);
+                    }
+                    guard.success(ip, email);
                     if (!user.isActive()) {
                         return Mono.just(ResponseEntity.badRequest().body(Map.of("error", "User is deactivated")));
                     }
-                    if (!userService.checkPassword(user, request.getPassword())) {
-                        return Mono.just(ResponseEntity.badRequest().body(Map.of("error", "Invalid credentials")));
-                    }
-                    String token = jwtUtils.generateToken(user.getEmail());
-                    LoginResponse response = new LoginResponse();
-                    response.setToken(token);
-                    response.setEmail(user.getEmail());
-                    return Mono.just(ResponseEntity.ok(response));
-                })
-                .onErrorResume(IllegalArgumentException.class, e ->
-                    Mono.just(ResponseEntity.badRequest().body(Map.of("error", "Invalid credentials")))
-                )
-        );
+                    return Mono.just(ResponseEntity.ok(token(user)));
+                });
+        });
     }
+
+    /** New mailbox in one of our domains; logs in right away (the answer carries the token). */
+    @PostMapping("/register")
+    public Mono<ResponseEntity<?>> register(@Valid @RequestBody Mono<RegisterRequest> requestMono) {
+        if (!registrationEnabled) {
+            return Mono.just(ResponseEntity.status(HttpStatus.FORBIDDEN).body(Map.of("error", "Registration is closed")));
+        }
+        return requestMono.flatMap(request -> {
+            String email = request.getEmail().trim().toLowerCase(Locale.ROOT);
+            String local = email.substring(0, email.indexOf('@'));
+            if (!domains.isLocal(email)) {
+                return Mono.just(ResponseEntity.badRequest()
+                        .body(Map.of("error", "Mailboxes can only be created in: " + String.join(", ", domains.domains()))));
+            }
+            if (RESERVED.contains(local) || !local.matches("[a-z0-9]([a-z0-9._-]{0,62}[a-z0-9])?")) {
+                return Mono.just(ResponseEntity.badRequest()
+                        .body(Map.of("error", "This name is not available: letters, digits, dot, dash, underscore")));
+            }
+            return userService.register(email, request.getPassword(), request.getDisplayName())
+                    .map(user -> ResponseEntity.status(HttpStatus.CREATED).body((Object) token(user)))
+                    .onErrorResume(IllegalArgumentException.class, e ->
+                            Mono.just(ResponseEntity.badRequest().body(Map.of("error", "This mailbox already exists"))));
+        });
+    }
+
+    @GetMapping("/me")
+    public Mono<ProfileResponse> me(Mono<Authentication> auth) {
+        return user(auth).flatMap(this::profile);
+    }
+
+    @PutMapping("/me")
+    public Mono<ProfileResponse> updateMe(Mono<Authentication> auth, @Valid @RequestBody Mono<ProfileUpdateRequest> body) {
+        return user(auth).zipWith(body)
+                .flatMap(pair -> userService.updateDisplayName(pair.getT1(), pair.getT2().displayName()))
+                .flatMap(this::profile);
+    }
+
+    @PutMapping("/me/password")
+    public Mono<Map<String, String>> changePassword(Mono<Authentication> auth, @Valid @RequestBody Mono<PasswordChangeRequest> body,
+                                                    ServerHttpRequest http) {
+        String ip = clientIp(http);
+        return user(auth).zipWith(body)
+                .flatMap(pair -> {
+                    User user = pair.getT1();
+                    // Someone with a stolen session must not guess the current password either
+                    Duration wait = guard.retryAfter(ip, user.getEmail());
+                    if (!wait.isZero()) {
+                        return Mono.error(new ResponseStatusException(HttpStatus.TOO_MANY_REQUESTS,
+                                "Too many failed attempts, try again in " + LoginGuard.human(wait)));
+                    }
+                    if (!userService.checkPassword(user, pair.getT2().currentPassword())) {
+                        guard.failure(ip, user.getEmail());
+                    }
+                    return userService.changePassword(user, pair.getT2().currentPassword(), pair.getT2().newPassword());
+                })
+                .thenReturn(Map.of("message", "Password changed"));
+    }
+
+    private static ResponseEntity<?> tooMany(Duration wait) {
+        return ResponseEntity.status(HttpStatus.TOO_MANY_REQUESTS)
+                .header(HttpHeaders.RETRY_AFTER, String.valueOf(Math.max(1, (wait.toMillis() + 999) / 1000)))
+                .body(Map.of("error", "Too many failed logins, try again in " + LoginGuard.human(wait)));
+    }
+
+    /** Client address; behind Caddy it comes from X-Forwarded-For (server.forward-headers-strategy=framework). */
+    static String clientIp(ServerHttpRequest http) {
+        InetSocketAddress address = http.getRemoteAddress();
+        if (address == null) {
+            return "unknown";
+        }
+        return address.getAddress() != null ? address.getAddress().getHostAddress() : address.getHostString();
+    }
+
+    private Mono<ProfileResponse> profile(User user) {
+        return mailService.usedBytes(user.getId())
+                .map(used -> new ProfileResponse(user.getEmail(), user.getDisplayName(), used,
+                        user.getQuotaBytes() == null ? 0 : user.getQuotaBytes(), user.getCreatedAt(),
+                        admins.isAdmin(user.getEmail())));
+    }
+
+    private Mono<User> user(Mono<Authentication> auth) {
+        return auth.switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.UNAUTHORIZED)))
+                .flatMap(a -> userService.findByEmail(a.getName()))
+                .onErrorMap(IllegalArgumentException.class, e -> new ResponseStatusException(HttpStatus.UNAUTHORIZED));
+    }
+
+    private LoginResponse token(User user) {
+        LoginResponse response = new LoginResponse();
+        response.setToken(jwtUtils.generateToken(user.getEmail()));
+        response.setEmail(user.getEmail());
+        return response;
+    }
+
 }

backend/src/main/java/com/mailserver/controller/MailController.java

@@ -3,31 +3,30 @@ package com.mailserver.controller;
 import com.mailserver.dto.AttachmentResponse;
 import com.mailserver.dto.FolderResponse;
 import com.mailserver.dto.MessageResponse;
-import com.mailserver.dto.RegisterRequest;
+import com.mailserver.dto.DraftRequest;
+import com.mailserver.dto.FolderRequest;
+import com.mailserver.dto.MessageUpdateRequest;
 import com.mailserver.dto.SendRequest;
 import com.mailserver.service.MailService;
 import com.mailserver.service.UserService;
 import jakarta.validation.Valid;
-import org.springframework.core.io.buffer.DataBuffer;
-import org.springframework.core.io.buffer.DataBufferUtils;
-import org.springframework.core.io.buffer.DefaultDataBufferFactory;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.codec.multipart.FilePart;
 import org.springframework.security.core.Authentication;
-import com.mailserver.config.MailDomains;
 import com.mailserver.service.SubmissionService;
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RequestPart;
 import org.springframework.web.bind.annotation.RestController;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
@@ -51,165 +50,148 @@ public class MailController {
     private final UserService userService;
     private final MailService mailService;
     private final SubmissionService submissionService;
-    private final MailDomains domains;
-    private final boolean registrationEnabled;
 
-    public MailController(UserService userService, MailService mailService, SubmissionService submissionService,
-                          MailDomains domains,
-                          @Value("${mailserver.registration.enabled:false}") boolean registrationEnabled) {
+    public MailController(UserService userService, MailService mailService, SubmissionService submissionService) {
         this.userService = userService;
         this.mailService = mailService;
         this.submissionService = submissionService;
-        this.domains = domains;
-        this.registrationEnabled = registrationEnabled;
     }
 
-    private Mono<String> getCurrentUserEmail(Mono<Authentication> authenticationMono) {
-        return authenticationMono.map(Authentication::getName);
+    private Mono<com.mailserver.domain.User> user(Mono<Authentication> auth) {
+        return auth.flatMap(a -> userService.findByEmail(a.getName()));
     }
 
-    // --- Users ---
-
-    @PostMapping("/register")
-    public Mono<ResponseEntity<?>> register(@Valid @RequestBody Mono<RegisterRequest> requestMono) {
-        if (!registrationEnabled) {
-            return Mono.just(org.springframework.http.ResponseEntity.status(HttpStatus.FORBIDDEN)
-                    .body(Map.of("error", "Registration is closed")));
-        }
-        return requestMono.flatMap(request -> !domains.isLocal(request.getEmail())
-            ? Mono.just(org.springframework.http.ResponseEntity.badRequest()
-                    .body(Map.of("error", "Mailboxes can only be created in: " + String.join(", ", domains.domains()))))
-            : userService.register(request.getEmail().trim().toLowerCase(java.util.Locale.ROOT), request.getPassword(), request.getDisplayName())
-                .map(user -> org.springframework.http.ResponseEntity.status(HttpStatus.CREATED)
-                        .body(Map.of("message", "User registered")))
-                .onErrorResume(IllegalArgumentException.class, e ->
-                    Mono.just(org.springframework.http.ResponseEntity.badRequest()
-                        .body(Map.of("error", e.getMessage()))))
-        );
-    }
+    // --- Folders ---
 
     @GetMapping("/folders")
-    public Flux<FolderResponse> getFolders(Mono<Authentication> authenticationMono) {
-        return authenticationMono.flatMapMany(auth ->
-            userService.findByEmail(auth.getName())
-                .flatMapMany(user -> userService.getFolders(user.getId()))
-        );
+    public Flux<FolderResponse> getFolders(Mono<Authentication> auth) {
+        return user(auth).flatMapMany(user -> mailService.folders(user.getId()));
+    }
+
+    @PostMapping("/folders")
+    public Mono<ResponseEntity<FolderResponse>> createFolder(Mono<Authentication> auth, @Valid @RequestBody Mono<FolderRequest> body) {
+        return user(auth).zipWith(body)
+                .flatMap(pair -> mailService.createFolder(pair.getT1().getId(), pair.getT2().name()))
+                .map(folder -> ResponseEntity.status(HttpStatus.CREATED).body(folder));
+    }
+
+    @PutMapping("/folders/{id}")
+    public Mono<Map<String, String>> renameFolder(@PathVariable Long id, Mono<Authentication> auth,
+                                                  @Valid @RequestBody Mono<FolderRequest> body) {
+        return user(auth).zipWith(body)
+                .flatMap(pair -> mailService.renameFolder(id, pair.getT1().getId(), pair.getT2().name()))
+                .thenReturn(Map.of("message", "Folder renamed"));
+    }
+
+    /** Own folder only; its messages go to the Trash. */
+    @DeleteMapping("/folders/{id}")
+    public Mono<Map<String, String>> deleteFolder(@PathVariable Long id, Mono<Authentication> auth) {
+        return user(auth).flatMap(user -> mailService.deleteFolder(id, user.getId()))
+                .thenReturn(Map.of("message", "Folder deleted"));
+    }
+
+    /** Trash or Spam: removes all its messages for good. */
+    @DeleteMapping("/folders/{id}/messages")
+    public Mono<Map<String, Object>> emptyFolder(@PathVariable Long id, Mono<Authentication> auth) {
+        return user(auth).flatMap(user -> mailService.emptyFolder(id, user.getId()))
+                .map(count -> Map.<String, Object>of("deleted", count));
     }
 
     // --- Messages ---
 
+    /** Newest first, bodies cut to a preview. */
     @GetMapping("/messages")
-    public Flux<MessageResponse> getMessages(
-            Mono<Authentication> authenticationMono,
-            @RequestParam Long folderId,
-            @RequestParam(defaultValue = "0") int page,
-            @RequestParam(defaultValue = "20") int size) {
-        return authenticationMono.flatMapMany(auth ->
-            userService.findByEmail(auth.getName())
-                .flatMapMany(user -> mailService.getMessages(folderId, user.getId(), page, size))
-        );
+    public Flux<MessageResponse> getMessages(Mono<Authentication> auth, @RequestParam Long folderId,
+                                             @RequestParam(defaultValue = "" + MailService.LIST_LIMIT) int limit) {
+        return user(auth).flatMapMany(user -> mailService.listMessages(folderId, user.getId(), limit));
     }
 
     @GetMapping("/messages/search")
     public Flux<MessageResponse> searchMessages(
-            Mono<Authentication> authenticationMono,
+            Mono<Authentication> auth,
             @RequestParam Long folderId,
             @RequestParam(required = false) String keyword,
             @RequestParam(required = false) String subject,
             @RequestParam(required = false) String body,
             @RequestParam(required = false) String sender,
-            @RequestParam(required = false) String recipient,
-            @RequestParam(defaultValue = "0") int page,
-            @RequestParam(defaultValue = "20") int size) {
-        return authenticationMono.flatMapMany(auth ->
-            userService.findByEmail(auth.getName())
-                .flatMapMany(user -> {
-                    if (keyword != null && !keyword.trim().isEmpty()) {
-                        return mailService.searchMessages(folderId, user.getId(), keyword.trim(), page, size);
-                    }
-                    return mailService.searchMessagesWithFilters(folderId, user.getId(),
-                            subject, body, sender, recipient, page, size);
-                })
-        );
+            @RequestParam(required = false) String recipient) {
+        return user(auth).flatMapMany(user -> keyword != null && !keyword.isBlank()
+                ? mailService.searchMessages(folderId, user.getId(), keyword.trim(), 0, MailService.LIST_LIMIT)
+                : mailService.searchMessagesWithFilters(folderId, user.getId(), subject, body, sender, recipient,
+                        0, MailService.LIST_LIMIT));
     }
 
     @GetMapping("/messages/{id}")
-    public Mono<MessageResponse> getMessage(@PathVariable Long id, Mono<Authentication> authenticationMono) {
-        return authenticationMono.flatMap(auth ->
-            userService.findByEmail(auth.getName())
-                .flatMap(user -> mailService.getMessage(id, user.getId()))
-        );
+    public Mono<MessageResponse> getMessage(@PathVariable Long id, Mono<Authentication> auth) {
+        return user(auth).flatMap(user -> mailService.getMessage(id, user.getId()));
     }
 
-    @PostMapping("/send")
-    public Mono<MessageResponse> sendMessage(
-            Mono<Authentication> authenticationMono,
-            @Valid @RequestBody Mono<SendRequest> requestMono) {
-        return authenticationMono.zipWith(requestMono)
-                .flatMap(pair -> submissionService.send(pair.getT1().getName(), pair.getT2()));
+    /** read / flagged / folderId — only the fields that are set. */
+    @PatchMapping("/messages/{id}")
+    public Mono<MessageResponse> updateMessage(@PathVariable Long id, Mono<Authentication> auth,
+                                               @RequestBody Mono<MessageUpdateRequest> body) {
+        return user(auth).zipWith(body)
+                .flatMap(pair -> mailService.updateMessage(id, pair.getT1().getId(), pair.getT2()));
     }
 
     @PutMapping("/messages/{id}/read")
-    public Mono<ResponseEntity<?>> markAsRead(@PathVariable Long id, Mono<Authentication> authenticationMono) {
-        return authenticationMono.flatMap(auth ->
-            userService.findByEmail(auth.getName())
-                .flatMap(user -> mailService.markAsRead(id, user.getId())
-                    .then(Mono.just(org.springframework.http.ResponseEntity.ok(Map.of("message", "Marked as read")))))
-        );
+    public Mono<Map<String, String>> markAsRead(@PathVariable Long id, Mono<Authentication> auth) {
+        return user(auth).flatMap(user -> mailService.markAsRead(id, user.getId()))
+                .thenReturn(Map.of("message", "Marked as read"));
     }
 
+    /** Into the Trash; from the Trash — for good. */
     @DeleteMapping("/messages/{id}")
-    public Mono<ResponseEntity<?>> deleteMessage(@PathVariable Long id, Mono<Authentication> authenticationMono) {
-        return authenticationMono.flatMap(auth ->
-            userService.findByEmail(auth.getName())
-                .flatMap(user -> mailService.deleteMessage(id, user.getId())
-                    .then(Mono.just(org.springframework.http.ResponseEntity.ok(Map.of("message", "Message deleted")))))
-        );
+    public Mono<Map<String, String>> deleteMessage(@PathVariable Long id, Mono<Authentication> auth) {
+        return user(auth).flatMap(user -> mailService.deleteMessage(id, user.getId()))
+                .thenReturn(Map.of("message", "Message deleted"));
+    }
+
+    @PostMapping("/send")
+    public Mono<MessageResponse> sendMessage(Mono<Authentication> auth, @Valid @RequestBody Mono<SendRequest> requestMono) {
+        return auth.zipWith(requestMono)
+                .flatMap(pair -> submissionService.send(pair.getT1().getName(), pair.getT2()));
+    }
+
+    // --- Drafts ---
+
+    @PostMapping("/drafts")
+    public Mono<MessageResponse> createDraft(Mono<Authentication> auth, @Valid @RequestBody Mono<DraftRequest> body) {
+        return user(auth).zipWith(body).flatMap(pair -> mailService.saveDraft(pair.getT1(), null, pair.getT2()));
+    }
+
+    @PutMapping("/drafts/{id}")
+    public Mono<MessageResponse> updateDraft(@PathVariable Long id, Mono<Authentication> auth,
+                                             @Valid @RequestBody Mono<DraftRequest> body) {
+        return user(auth).zipWith(body).flatMap(pair -> mailService.saveDraft(pair.getT1(), id, pair.getT2()));
     }
 
     // --- Attachments ---
 
+    /** A file for a draft (form field "file"); stored on disk, the draft gets the record. */
     @PostMapping(value = "/messages/{messageId}/attachments", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
-    public Mono<ResponseEntity<?>> uploadAttachment(
+    public Mono<ResponseEntity<AttachmentResponse>> uploadAttachment(
             @PathVariable Long messageId,
-            Mono<Authentication> authenticationMono,
-            @RequestBody Mono<Flux<FilePart>> filePartsMono) {
-        return authenticationMono.zipWith(filePartsMono)
-                .flatMap(pair -> {
-                    String email = pair.getT1().getName();
-                    return userService.findByEmail(email)
-                        .flatMapMany(user -> pair.getT2())
-                        .next()
-                        .flatMap(file -> {
-                            String originalFilename = safeFilename(file.filename());
-                            String uniqueName = UUID.randomUUID() + "_" + originalFilename;
-                            Path filePath = Paths.get(mailService.getAttachmentsDir(), uniqueName);
-                            try {
-                                Files.createDirectories(filePath.getParent());
-                            } catch (IOException e) {
-                                return Mono.error(new RuntimeException("Failed to create directory", e));
-                            }
-
-                            return DataBufferUtils.join(file.content())
-                                    .flatMap(dataBuffer -> {
-                                        byte[] bytes = new byte[dataBuffer.readableByteCount()];
-                                        dataBuffer.read(bytes);
-                                        DataBufferUtils.release(dataBuffer);
-                                        try {
-                                            Files.write(filePath, bytes);
-                                        } catch (IOException e) {
-                                            return Mono.error(new RuntimeException("Failed to save file", e));
-                                        }
-                                        return userService.findByEmail(email)
-                                            .flatMap(user -> mailService.saveAttachmentReactive(
-                                                messageId, user.getId(),
-                                                originalFilename,
-                                                file.headers().getContentType() != null ? file.headers().getContentType().toString() : "application/octet-stream",
-                                                bytes.length, filePath.toString()))
-                                            .map(response -> org.springframework.http.ResponseEntity.status(HttpStatus.CREATED).body(response));
-                                    });
-                        });
-                });
+            Mono<Authentication> auth,
+            @RequestPart("file") Mono<FilePart> fileMono) {
+        return user(auth).zipWith(fileMono).flatMap(pair -> {
+            var user = pair.getT1();
+            FilePart file = pair.getT2();
+            String originalFilename = safeFilename(file.filename());
+            Path filePath = Paths.get(mailService.getAttachmentsDir(), UUID.randomUUID() + "_" + originalFilename);
+            String contentType = file.headers().getContentType() != null
+                    ? file.headers().getContentType().toString() : "application/octet-stream";
+            // the draft must be the user's before anything is written
+            return mailService.ownedDraft(messageId, user.getId())
+                    .then(Mono.fromCallable(() -> Files.createDirectories(filePath.getParent()))
+                            .subscribeOn(reactor.core.scheduler.Schedulers.boundedElastic()))
+                    .then(file.transferTo(filePath))
+                    .then(Mono.fromCallable(() -> Files.size(filePath))
+                            .subscribeOn(reactor.core.scheduler.Schedulers.boundedElastic()))
+                    .flatMap(size -> mailService.saveAttachmentReactive(messageId, user.getId(), originalFilename,
+                            contentType, size, filePath.toString()))
+                    .map(response -> ResponseEntity.status(HttpStatus.CREATED).body(response));
+        });
     }
 
     @GetMapping("/messages/{messageId}/attachments")
@@ -246,7 +228,7 @@ public class MailController {
     }
 
     /** Only the last path segment, no control characters — a file name cannot leave the attachments folder. */
-    static String safeFilename(String name) {
+    public static String safeFilename(String name) {
         String base = name == null ? "" : name.replace('\\', '/');
         base = base.substring(base.lastIndexOf('/') + 1).replaceAll("[\\p{Cntrl}\"]", "").trim();
         if (base.isEmpty() || base.equals(".") || base.equals("..")) {

backend/src/main/java/com/mailserver/controller/MailboxAdminController.java

@@ -0,0 +1,184 @@
+package com.mailserver.controller;
+
+import com.mailserver.config.MailAdmins;
+import com.mailserver.config.MailDomains;
+import com.mailserver.domain.User;
+import com.mailserver.dto.LoginResponse;
+import com.mailserver.service.MailService;
+import com.mailserver.service.UserService;
+import com.mailserver.util.JwtUtils;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import java.security.SecureRandom;
+import java.time.Instant;
+import java.util.Base64;
+import java.util.Comparator;
+import java.util.Locale;
+import java.util.regex.Pattern;
+
+/**
+ * Mailboxes of this server for its administrators ({@link MailAdmins}): list, create (no-reply@, monitor@,
+ * support@ — registration stays closed), new password, switch off. A generated password is returned once, in the
+ * answer — it is not logged.
+ */
+@RestController
+@RequestMapping("/api/admin/mailboxes")
+public class MailboxAdminController {
+
+    private static final Logger log = LoggerFactory.getLogger(MailboxAdminController.class);
+    private static final Pattern LOCAL_PART = Pattern.compile("[a-z0-9](?:[a-z0-9._+-]{0,62}[a-z0-9])?");
+    private static final int MIN_PASSWORD = 10;
+
+    public record MailboxView(Long id, String email, String displayName, boolean active, boolean admin,
+                              long usedBytes, long quotaBytes, Instant createdAt) {
+    }
+
+    /** @param password empty — the server generates one and returns it once */
+    public record CreateRequest(@NotBlank @Size(max = 254) String email, @Size(max = 100) String displayName,
+                                @Size(max = 200) String password) {
+    }
+
+    public record PasswordRequest(@Size(max = 200) String password) {
+    }
+
+    public record ActiveRequest(boolean active) {
+    }
+
+    /** @param password the generated password, or null when the administrator chose it */
+    public record Created(MailboxView mailbox, String password) {
+    }
+
+    private final UserService users;
+    private final MailService mail;
+    private final MailDomains domains;
+    private final MailAdmins admins;
+    private final JwtUtils jwt;
+
+    public MailboxAdminController(UserService users, MailService mail, MailDomains domains, MailAdmins admins, JwtUtils jwt) {
+        this.jwt = jwt;
+        this.users = users;
+        this.mail = mail;
+        this.domains = domains;
+        this.admins = admins;
+    }
+
+    @GetMapping
+    public Flux<MailboxView> list(Mono<Authentication> auth) {
+        return admin(auth).thenMany(users.all())
+                .concatMap(this::view)
+                .sort(Comparator.comparing(MailboxView::email));
+    }
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Mono<Created> create(Mono<Authentication> auth, @RequestBody Mono<CreateRequest> body) {
+        return admin(auth).then(body).flatMap(request -> {
+            String email = request.email() == null ? "" : request.email().trim().toLowerCase(Locale.ROOT);
+            int at = email.lastIndexOf('@');
+            if (at <= 0 || !LOCAL_PART.matcher(email.substring(0, at)).matches()) {
+                return Mono.error(bad("Not a mailbox address: " + email));
+            }
+            if (!domains.isLocal(email)) {
+                return Mono.error(bad("Mailboxes can be created only in " + String.join(", ", domains.domains().stream().sorted().toList())));
+            }
+            String chosen = request.password() == null ? "" : request.password();
+            if (!chosen.isEmpty() && chosen.length() < MIN_PASSWORD) {
+                return Mono.error(bad("Password: at least " + MIN_PASSWORD + " characters, or leave it empty to generate one"));
+            }
+            String password = chosen.isEmpty() ? randomPassword() : chosen;
+            return users.register(email, password, request.displayName())
+                    .onErrorMap(IllegalArgumentException.class, e -> new ResponseStatusException(HttpStatus.CONFLICT, "This mailbox already exists"))
+                    .doOnNext(user -> log.info("Mailbox created by administrator: {}", email))
+                    .flatMap(this::view)
+                    .map(view -> new Created(view, chosen.isEmpty() ? password : null));
+        });
+    }
+
+    /** New password: the given one, or a generated one returned once. */
+    @PostMapping("/{id}/password")
+    public Mono<Created> password(Mono<Authentication> auth, @PathVariable Long id, @RequestBody Mono<PasswordRequest> body) {
+        return admin(auth).then(body.defaultIfEmpty(new PasswordRequest(null))).flatMap(request -> {
+            String chosen = request.password() == null ? "" : request.password();
+            if (!chosen.isEmpty() && chosen.length() < MIN_PASSWORD) {
+                return Mono.error(bad("Password: at least " + MIN_PASSWORD + " characters, or leave it empty to generate one"));
+            }
+            String password = chosen.isEmpty() ? randomPassword() : chosen;
+            return mailbox(id)
+                    .flatMap(user -> users.setPassword(user, password))
+                    .doOnNext(user -> log.info("Password of {} set by administrator", user.getEmail()))
+                    .flatMap(this::view)
+                    .map(view -> new Created(view, chosen.isEmpty() ? password : null));
+        });
+    }
+
+    /**
+     * Administrator opens a mailbox without its password (Settings → MAILBOXES → Open): a session of that mailbox.
+     * Every opening is logged — who opened which mailbox.
+     */
+    @PostMapping("/{id}/open")
+    public Mono<LoginResponse> open(Mono<Authentication> auth, @PathVariable Long id) {
+        return admin(auth).flatMap(me -> mailbox(id).map(user -> {
+            log.warn("Administrator {} opened mailbox {}", me, user.getEmail());
+            LoginResponse response = new LoginResponse();
+            response.setToken(jwt.generateToken(user.getEmail()));
+            response.setEmail(user.getEmail());
+            return response;
+        }));
+    }
+
+    /** Switched off: no login (web, SMTP, IMAP); mail to it is still received. */
+    @PutMapping("/{id}/active")
+    public Mono<MailboxView> active(Mono<Authentication> auth, @PathVariable Long id, @RequestBody Mono<ActiveRequest> body) {
+        return admin(auth).flatMap(me -> body.flatMap(request -> mailbox(id).flatMap(user -> {
+            if (!request.active() && user.getEmail().equalsIgnoreCase(me)) {
+                return Mono.error(bad("You can not switch off your own mailbox"));
+            }
+            log.info("Mailbox {} {} by administrator", user.getEmail(), request.active() ? "switched on" : "switched off");
+            return users.setActive(user, request.active());
+        }))).flatMap(this::view);
+    }
+
+    private Mono<String> admin(Mono<Authentication> auth) {
+        return auth.switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.UNAUTHORIZED)))
+                .map(Authentication::getName)
+                .filter(admins::isAdmin)
+                .switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.FORBIDDEN, "Only for mail administrators")));
+    }
+
+    private Mono<User> mailbox(Long id) {
+        return users.byId(id).switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.NOT_FOUND, "Mailbox not found")));
+    }
+
+    private Mono<MailboxView> view(User user) {
+        return mail.usedBytes(user.getId()).defaultIfEmpty(0L)
+                .map(used -> new MailboxView(user.getId(), user.getEmail(), user.getDisplayName(), user.isActive(),
+                        admins.isAdmin(user.getEmail()), used, user.getQuotaBytes() == null ? 0 : user.getQuotaBytes(),
+                        user.getCreatedAt()));
+    }
+
+    private static ResponseStatusException bad(String message) {
+        return new ResponseStatusException(HttpStatus.BAD_REQUEST, message);
+    }
+
+    static String randomPassword() {
+        byte[] bytes = new byte[18];
+        new SecureRandom().nextBytes(bytes);
+        return Base64.getUrlEncoder().withoutPadding().encodeToString(bytes);
+    }
+}

backend/src/main/java/com/mailserver/domain/Folder.java

@@ -24,6 +24,9 @@ public class Folder {
     @Column("unread_count")
     private Integer unreadCount = 0;
 
+    @Column("is_system")
+    private boolean system;
+
     @Column("created_at")
     private Instant createdAt;
 
@@ -42,6 +45,9 @@ public class Folder {
     public Integer getUnreadCount() { return unreadCount; }
     public void setUnreadCount(Integer unreadCount) { this.unreadCount = unreadCount; }
 
+    public boolean isSystem() { return system; }
+    public void setSystem(boolean system) { this.system = system; }
+
     public Instant getCreatedAt() { return createdAt; }
     public void setCreatedAt(Instant createdAt) { this.createdAt = createdAt; }
 }

backend/src/main/java/com/mailserver/domain/Message.java

@@ -24,6 +24,9 @@ public class Message {
     @Column("recipient_email")
     private String recipientEmail;
 
+    @Column("cc_email")
+    private String ccEmail;
+
     @Column("subject")
     private String subject;
 
@@ -66,6 +69,9 @@ public class Message {
     public String getRecipientEmail() { return recipientEmail; }
     public void setRecipientEmail(String recipientEmail) { this.recipientEmail = recipientEmail; }
 
+    public String getCcEmail() { return ccEmail; }
+    public void setCcEmail(String ccEmail) { this.ccEmail = ccEmail; }
+
     public String getSubject() { return subject; }
     public void setSubject(String subject) { this.subject = subject; }
 

backend/src/main/java/com/mailserver/dto/DraftRequest.java

@@ -0,0 +1,8 @@
+package com.mailserver.dto;
+
+import jakarta.validation.constraints.Size;
+
+/** A draft: everything optional, addresses are not checked until it is sent. */
+public record DraftRequest(@Size(max = 5000) String to, @Size(max = 5000) String cc,
+                           @Size(max = 1000) String subject, @Size(max = 1_000_000) String body, boolean html) {
+}

backend/src/main/java/com/mailserver/dto/FolderRequest.java

@@ -0,0 +1,7 @@
+package com.mailserver.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public record FolderRequest(@NotBlank @Size(max = 50) String name) {
+}

backend/src/main/java/com/mailserver/dto/FolderResponse.java

@@ -1,23 +1,5 @@
 package com.mailserver.dto;
 
-import java.time.Instant;
-
-public class FolderResponse {
-
-    private Long id;
-    private String name;
-    private Integer messageCount;
-    private Integer unreadCount;
-
-    public Long getId() { return id; }
-    public void setId(Long id) { this.id = id; }
-
-    public String getName() { return name; }
-    public void setName(String name) { this.name = name; }
-
-    public Integer getMessageCount() { return messageCount; }
-    public void setMessageCount(Integer messageCount) { this.messageCount = messageCount; }
-
-    public Integer getUnreadCount() { return unreadCount; }
-    public void setUnreadCount(Integer unreadCount) { this.unreadCount = unreadCount; }
+/** A folder with live counters; system = INBOX, Drafts, Sent, Spam, Trash (cannot be renamed or deleted). */
+public record FolderResponse(Long id, String name, boolean system, long messageCount, long unreadCount) {
 }

backend/src/main/java/com/mailserver/dto/MessageResponse.java

@@ -8,6 +8,7 @@ public class MessageResponse {
     private String senderEmail;
     private String senderName;
     private String recipientEmail;
+    private String ccEmail;
     private String subject;
     private String body;
     private boolean html;
@@ -32,6 +33,9 @@ public class MessageResponse {
     public String getRecipientEmail() { return recipientEmail; }
     public void setRecipientEmail(String recipientEmail) { this.recipientEmail = recipientEmail; }
 
+    public String getCcEmail() { return ccEmail; }
+    public void setCcEmail(String ccEmail) { this.ccEmail = ccEmail; }
+
     public String getSubject() { return subject; }
     public void setSubject(String subject) { this.subject = subject; }
 

backend/src/main/java/com/mailserver/dto/MessageUpdateRequest.java

@@ -0,0 +1,5 @@
+package com.mailserver.dto;
+
+/** Partial update of a message: only the fields that are set change. */
+public record MessageUpdateRequest(Boolean read, Boolean flagged, Long folderId) {
+}

backend/src/main/java/com/mailserver/dto/PasswordChangeRequest.java

@@ -0,0 +1,7 @@
+package com.mailserver.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public record PasswordChangeRequest(@NotBlank String currentPassword, @NotBlank @Size(min = 8, max = 100) String newPassword) {
+}

backend/src/main/java/com/mailserver/dto/ProfileResponse.java

@@ -0,0 +1,8 @@
+package com.mailserver.dto;
+
+import java.time.Instant;
+
+/** @param admin may manage mailboxes ({@link com.mailserver.config.MailAdmins}) */
+public record ProfileResponse(String email, String displayName, long usedBytes, long quotaBytes, Instant createdAt,
+                              boolean admin) {
+}

backend/src/main/java/com/mailserver/dto/ProfileUpdateRequest.java

@@ -0,0 +1,7 @@
+package com.mailserver.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public record ProfileUpdateRequest(@NotBlank @Size(max = 100) String displayName) {
+}

backend/src/main/java/com/mailserver/dto/RegisterRequest.java

@@ -12,7 +12,7 @@ public class RegisterRequest {
     private String email;
 
     @NotBlank
-    @Size(min = 6, max = 100)
+    @Size(min = 8, max = 100)
     private String password;
 
     @Size(max = 100)

backend/src/main/java/com/mailserver/dto/SendRequest.java

@@ -1,31 +1,46 @@
 package com.mailserver.dto;
 
-import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
 
+/**
+ * "Send" from the web client. {@code to} and {@code cc}: one or more addresses separated by commas, semicolons or
+ * spaces. {@code draftId}: the draft being sent — its attachments go with the message, the draft is removed.
+ */
 public class SendRequest {
 
     @NotBlank
-    @Email
+    @Size(max = 5000)
     private String to;
 
-    @NotBlank
+    @Size(max = 5000)
+    private String cc;
+
+    @Size(max = 1000)
     private String subject;
 
-    @NotBlank
+    @Size(max = 1_000_000)
     private String body;
 
     private boolean html = false;
 
+    private Long draftId;
+
     public String getTo() { return to; }
     public void setTo(String to) { this.to = to; }
 
-    public String getSubject() { return subject; }
+    public String getCc() { return cc; }
+    public void setCc(String cc) { this.cc = cc; }
+
+    public String getSubject() { return subject == null ? "" : subject; }
     public void setSubject(String subject) { this.subject = subject; }
 
-    public String getBody() { return body; }
+    public String getBody() { return body == null ? "" : body; }
     public void setBody(String body) { this.body = body; }
 
     public boolean isHtml() { return html; }
     public void setHtml(boolean html) { this.html = html; }
+
+    public Long getDraftId() { return draftId; }
+    public void setDraftId(Long draftId) { this.draftId = draftId; }
 }

backend/src/main/java/com/mailserver/imap/DbImapStore.java

@@ -0,0 +1,285 @@
+package com.mailserver.imap;
+
+import com.mailserver.domain.Attachment;
+import com.mailserver.domain.Message;
+import com.mailserver.domain.User;
+import com.mailserver.repository.AttachmentRepository;
+import com.mailserver.repository.MessageRepository;
+import com.mailserver.repository.UserRepository;
+import com.mailserver.service.LocalDelivery;
+import com.mailserver.service.MailService;
+import com.mailserver.service.MessageSources;
+import com.mailserver.service.UserService;
+import jakarta.mail.Session;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeMessage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.Properties;
+import java.util.UUID;
+
+/** {@link ImapStore} over the mail server's PostgreSQL tables (the same data the web client shows). */
+public class DbImapStore implements ImapStore {
+
+    private static final Logger log = LoggerFactory.getLogger(DbImapStore.class);
+
+    private final DatabaseClient db;
+    private final UserRepository users;
+    private final UserService userService;
+    private final MailService mailService;
+    private final MessageRepository messages;
+    private final AttachmentRepository attachments;
+    private final MessageSources sources;
+    private final String hostname;
+
+    public DbImapStore(DatabaseClient db, UserRepository users, UserService userService, MailService mailService,
+                       MessageRepository messages, AttachmentRepository attachments, MessageSources sources,
+                       String hostname) {
+        this.db = db;
+        this.users = users;
+        this.userService = userService;
+        this.mailService = mailService;
+        this.messages = messages;
+        this.attachments = attachments;
+        this.sources = sources;
+        this.hostname = hostname;
+    }
+
+    @Override
+    public Account authenticate(String username, String password) {
+        User user = users.findByEmail(username.trim().toLowerCase(Locale.ROOT)).block();
+        if (user == null || !user.isActive() || !userService.checkPassword(user, password)) {
+            return null;
+        }
+        return new Account(user.getId(), user.getEmail());
+    }
+
+    @Override
+    public List<Mailbox> mailboxes(long userId) {
+        return db.sql("SELECT id, name, is_system, uid_validity, uid_next FROM folders WHERE user_id = :u ORDER BY id")
+                .bind("u", userId)
+                .map(row -> new Mailbox(row.get("id", Long.class), row.get("name", String.class),
+                        Boolean.TRUE.equals(row.get("is_system", Boolean.class)),
+                        row.get("uid_validity", Long.class), row.get("uid_next", Long.class)))
+                .all().collectList().block();
+    }
+
+    @Override
+    public Mailbox create(long userId, String name) {
+        try {
+            var created = mailService.createFolder(userId, name).block();
+            return mailboxes(userId).stream().filter(m -> m.id() == created.id()).findFirst().orElseThrow();
+        } catch (ResponseStatusException e) {
+            throw new Refused(e.getReason());
+        }
+    }
+
+    @Override
+    public void rename(long userId, Mailbox mailbox, String newName) {
+        try {
+            mailService.renameFolder(mailbox.id(), userId, newName).block();
+        } catch (ResponseStatusException e) {
+            throw new Refused(e.getReason());
+        }
+    }
+
+    @Override
+    public void delete(long userId, Mailbox mailbox) {
+        try {
+            mailService.deleteFolder(mailbox.id(), userId).block();
+        } catch (ResponseStatusException e) {
+            throw new Refused(e.getReason());
+        }
+    }
+
+    @Override
+    public List<Entry> entries(long folderId) {
+        return db.sql("SELECT id, uid, is_read, is_flagged, is_answered, is_deleted, received_at FROM messages "
+                        + "WHERE folder_id = :f ORDER BY uid")
+                .bind("f", folderId)
+                .map(row -> new Entry(row.get("id", Long.class), row.get("uid", Long.class),
+                        Boolean.TRUE.equals(row.get("is_read", Boolean.class)),
+                        Boolean.TRUE.equals(row.get("is_flagged", Boolean.class)),
+                        Boolean.TRUE.equals(row.get("is_answered", Boolean.class)),
+                        Boolean.TRUE.equals(row.get("is_deleted", Boolean.class)),
+                        instant(row.get("received_at"))))
+                .all().collectList().block();
+    }
+
+    @Override
+    public byte[] source(long messageId) {
+        byte[] raw = sources.get(messageId).block();
+        if (raw != null) {
+            return raw;
+        }
+        Message message = messages.findById(messageId).block();
+        if (message == null) {
+            return new byte[0];
+        }
+        try {
+            List<Attachment> files = attachments.findByMessageId(messageId).collectList().block();
+            raw = MimeSource.build(message, files, hostname);
+        } catch (Exception e) {
+            log.warn("IMAP: cannot build message {}: {}", messageId, e.toString());
+            return ("Subject: " + message.getSubject() + "\r\n\r\n" + message.getBody()).getBytes();
+        }
+        sources.put(messageId, raw).block();
+        return raw;
+    }
+
+    @Override
+    public void setFlags(long messageId, boolean seen, boolean flagged, boolean answered, boolean deleted) {
+        db.sql("UPDATE messages SET is_read = :s, is_flagged = :f, is_answered = :a, is_deleted = :d WHERE id = :id")
+                .bind("s", seen).bind("f", flagged).bind("a", answered).bind("d", deleted).bind("id", messageId)
+                .then().block();
+    }
+
+    @Override
+    public long append(long userId, Mailbox target, byte[] raw, boolean seen, boolean flagged, boolean answered,
+                       boolean deleted, Instant internalDate) {
+        try {
+            MimeMessage mime = new MimeMessage(Session.getInstance(new Properties()), new ByteArrayInputStream(raw));
+            Message message = new Message();
+            message.setFolderId(target.id());
+            String senderEmail = "unknown@" + hostname;
+            String senderName = null;
+            if (mime.getFrom() != null && mime.getFrom().length > 0 && mime.getFrom()[0] instanceof InternetAddress from) {
+                senderEmail = from.getAddress();
+                senderName = from.getPersonal();
+            }
+            message.setSenderEmail(senderEmail);
+            message.setSenderName(senderName);
+            String to = LocalDelivery.addresses(mime, jakarta.mail.Message.RecipientType.TO);
+            message.setRecipientEmail(to == null ? "" : to);
+            message.setCcEmail(LocalDelivery.addresses(mime, jakarta.mail.Message.RecipientType.CC));
+            message.setSubject(mime.getSubject() == null ? "" : mime.getSubject());
+            LocalDelivery.Body body = LocalDelivery.body(mime);
+            message.setBody(body.text());
+            message.setHtml(body.html());
+            message.setRead(seen);
+            message.setFlagged(flagged);
+            message.setSpam(target.system() && "Spam".equals(target.name()));
+            message.setReceivedAt(internalDate == null ? Instant.now() : internalDate);
+            String messageId = mime.getMessageID();
+            message.setMessageId(messageId == null ? UUID.randomUUID().toString() : messageId.replaceAll("^<|>$", ""));
+            message.setMessageSize((long) raw.length);
+            Message stored = messages.save(message).block();
+            for (LocalDelivery.FilePart file : LocalDelivery.attachments(mime)) {
+                mailService.storeIncomingAttachment(stored.getId(), file.name(), file.contentType(), file.bytes());
+            }
+            sources.put(stored.getId(), raw).block();
+            setFlags(stored.getId(), seen, flagged, answered, deleted);
+            return uid(stored.getId());
+        } catch (Refused e) {
+            throw e;
+        } catch (Exception e) {
+            log.warn("IMAP APPEND to {} failed: {}", target.name(), e.toString());
+            throw new Refused("Cannot store the message: " + e.getMessage());
+        }
+    }
+
+    @Override
+    public List<Long> copy(long userId, List<Entry> list, Mailbox target) {
+        boolean spam = target.system() && "Spam".equals(target.name());
+        List<Long> uids = new ArrayList<>();
+        for (Entry entry : list) {
+            Long newId = db.sql("INSERT INTO messages (folder_id, sender_email, sender_name, recipient_email, cc_email, "
+                            + "subject, body, is_html, is_read, is_flagged, is_spam, is_answered, is_deleted, message_size, "
+                            + "received_at, message_id) "
+                            + "SELECT :t, sender_email, sender_name, recipient_email, cc_email, subject, body, is_html, "
+                            + "is_read, is_flagged, :spam, is_answered, is_deleted, message_size, received_at, message_id "
+                            + "FROM messages WHERE id = :id RETURNING id")
+                    .bind("t", target.id()).bind("spam", spam).bind("id", entry.id())
+                    .map(row -> row.get("id", Long.class)).one().block();
+            if (newId == null) {
+                continue;
+            }
+            for (Attachment attachment : attachments.findByMessageId(entry.id()).collectList().block()) {
+                copyAttachment(attachment, newId);
+            }
+            db.sql("INSERT INTO message_sources (message_id, raw) SELECT :n, raw FROM message_sources WHERE message_id = :o")
+                    .bind("n", newId).bind("o", entry.id()).then().block();
+            uids.add(uid(newId));
+        }
+        return uids;
+    }
+
+    private void copyAttachment(Attachment attachment, long newMessageId) {
+        try {
+            Path from = Paths.get(attachment.getFilePath());
+            Path to = from.resolveSibling(UUID.randomUUID() + "_" + from.getFileName().toString().replaceFirst("^[0-9a-f-]{36}_", ""));
+            Files.copy(from, to);
+            Attachment copy = new Attachment();
+            copy.setMessageId(newMessageId);
+            copy.setFilename(attachment.getFilename());
+            copy.setContentType(attachment.getContentType());
+            copy.setSizeBytes(attachment.getSizeBytes());
+            copy.setFilePath(to.toString());
+            copy.setContentId(attachment.getContentId());
+            attachments.save(copy).block();
+        } catch (IOException e) {
+            log.warn("IMAP COPY: attachment {} not copied: {}", attachment.getFilePath(), e.toString());
+        }
+    }
+
+    @Override
+    public List<Long> move(long userId, List<Entry> list, Mailbox target) {
+        boolean spam = target.system() && "Spam".equals(target.name());
+        List<Long> uids = new ArrayList<>();
+        for (Entry entry : list) {
+            Long uid = db.sql("UPDATE messages SET folder_id = :t, is_spam = :spam WHERE id = :id RETURNING uid")
+                    .bind("t", target.id()).bind("spam", spam).bind("id", entry.id())
+                    .map(row -> row.get("uid", Long.class)).one().block();
+            if (uid != null) {
+                uids.add(uid);
+            }
+        }
+        return uids;
+    }
+
+    @Override
+    public void expunge(List<Long> messageIds) {
+        for (Long id : messageIds) {
+            for (Attachment attachment : attachments.findByMessageId(id).collectList().block()) {
+                try {
+                    Files.deleteIfExists(Paths.get(attachment.getFilePath()));
+                } catch (IOException e) {
+                    log.warn("Attachment file {} not deleted: {}", attachment.getFilePath(), e.getMessage());
+                }
+            }
+            messages.deleteById(id).block();
+        }
+    }
+
+    private long uid(long messageId) {
+        return db.sql("SELECT uid FROM messages WHERE id = :id").bind("id", messageId)
+                .map(row -> row.get("uid", Long.class)).one().block();
+    }
+
+    private static Instant instant(Object value) {
+        if (value instanceof Instant instant) {
+            return instant;
+        }
+        if (value instanceof LocalDateTime local) {
+            return local.toInstant(ZoneOffset.UTC);
+        }
+        if (value instanceof java.time.OffsetDateTime offset) {
+            return offset.toInstant();
+        }
+        return Instant.EPOCH;
+    }
+}

backend/src/main/java/com/mailserver/imap/ImapReader.java

@@ -0,0 +1,194 @@
+package com.mailserver.imap;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Reads one IMAP command: the decoder has already collected it whole, with its literals inline
+ * ("{n}\r\n" + n bytes, or "{n+}\r\n" + n bytes).
+ */
+final class ImapReader {
+
+    static final class SyntaxError extends RuntimeException {
+        SyntaxError(String message) {
+            super(message);
+        }
+    }
+
+    private final byte[] b;
+    private int pos;
+
+    ImapReader(byte[] command) {
+        this(command, true);
+    }
+
+    private ImapReader(byte[] command, boolean stripLineEnd) {
+        int end = command.length;
+        if (!stripLineEnd) {
+            this.b = command;
+            return;
+        }
+        if (end > 0 && command[end - 1] == '\n') {
+            end--;
+        }
+        if (end > 0 && command[end - 1] == '\r') {
+            end--;
+        }
+        this.b = java.util.Arrays.copyOf(command, end);
+    }
+
+    boolean atEnd() {
+        return pos >= b.length;
+    }
+
+    int peek() {
+        return pos < b.length ? b[pos] & 0xff : -1;
+    }
+
+    void sp() {
+        if (peek() != ' ') {
+            throw new SyntaxError("Expected a space");
+        }
+        while (peek() == ' ') {
+            pos++;
+        }
+    }
+
+    boolean optionalSp() {
+        if (peek() == ' ') {
+            sp();
+            return true;
+        }
+        return false;
+    }
+
+    void expect(char c) {
+        if (peek() != c) {
+            throw new SyntaxError("Expected '" + c + "'");
+        }
+        pos++;
+    }
+
+    /** Characters up to a space, parenthesis, or the end (an atom; also tags, sequence sets, flags). */
+    String atom() {
+        int start = pos;
+        while (pos < b.length) {
+            int c = b[pos] & 0xff;
+            if (c == ' ' || c == '(' || c == ')' || c == '{' || c == '"' || c < 0x20 || c == 0x7f) {
+                break;
+            }
+            pos++;
+        }
+        if (pos == start) {
+            throw new SyntaxError("Expected an atom");
+        }
+        return new String(b, start, pos - start, StandardCharsets.UTF_8);
+    }
+
+    /** Atom, quoted string or literal. */
+    String astring() {
+        int c = peek();
+        if (c == '"' || c == '{') {
+            return new String(stringBytes(), StandardCharsets.UTF_8);
+        }
+        return atom();
+    }
+
+    /** Quoted string or literal, raw bytes. */
+    byte[] stringBytes() {
+        int c = peek();
+        if (c == '"') {
+            pos++;
+            java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
+            while (true) {
+                if (pos >= b.length) {
+                    throw new SyntaxError("Unterminated quoted string");
+                }
+                byte x = b[pos++];
+                if (x == '"') {
+                    return out.toByteArray();
+                }
+                if (x == '\\' && pos < b.length) {
+                    x = b[pos++];
+                }
+                out.write(x);
+            }
+        }
+        if (c == '{') {
+            int close = indexOf('}', pos);
+            if (close < 0) {
+                throw new SyntaxError("Bad literal");
+            }
+            String size = new String(b, pos + 1, close - pos - 1, StandardCharsets.US_ASCII);
+            if (size.endsWith("+")) {
+                size = size.substring(0, size.length() - 1);
+            }
+            int length;
+            try {
+                length = Integer.parseInt(size);
+            } catch (NumberFormatException e) {
+                throw new SyntaxError("Bad literal size");
+            }
+            pos = close + 1;
+            if (peek() == '\r') {
+                pos++;
+            }
+            expect('\n');
+            if (pos + length > b.length) {
+                throw new SyntaxError("Literal shorter than announced");
+            }
+            byte[] data = java.util.Arrays.copyOfRange(b, pos, pos + length);
+            pos += length;
+            return data;
+        }
+        throw new SyntaxError("Expected a string");
+    }
+
+    /** "(a b c)" → [a, b, c] (atoms or strings); an atom without parentheses → [atom]. */
+    List<String> list() {
+        List<String> items = new ArrayList<>();
+        if (peek() != '(') {
+            items.add(astring());
+            return items;
+        }
+        pos++;
+        while (peek() == ' ') {
+            pos++;
+        }
+        while (peek() != ')') {
+            if (atEnd()) {
+                throw new SyntaxError("Unterminated list");
+            }
+            items.add(astring());
+            while (peek() == ' ') {
+                pos++;
+            }
+        }
+        pos++;
+        return items;
+    }
+
+    /** Everything left, as text (used for FETCH attributes and SEARCH keys parsed by their own readers). */
+    String rest() {
+        String text = new String(b, pos, b.length - pos, StandardCharsets.UTF_8);
+        pos = b.length;
+        return text;
+    }
+
+    /** A reader over the rest, as is (SEARCH may hold literals). */
+    ImapReader restReader() {
+        ImapReader reader = new ImapReader(java.util.Arrays.copyOfRange(b, pos, b.length), false);
+        pos = b.length;
+        return reader;
+    }
+
+    private int indexOf(char c, int from) {
+        for (int i = from; i < b.length; i++) {
+            if (b[i] == c) {
+                return i;
+            }
+        }
+        return -1;
+    }
+}

backend/src/main/java/com/mailserver/imap/ImapServer.java

@@ -0,0 +1,273 @@
+package com.mailserver.imap;
+
+import com.mailserver.security.LoginGuard;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelPipeline;
+import io.netty.handler.codec.ByteToMessageDecoder;
+import io.netty.handler.codec.TooLongFrameException;
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslHandler;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.core.publisher.Sinks;
+import reactor.core.scheduler.Schedulers;
+import reactor.netty.Connection;
+import reactor.netty.DisposableServer;
+import reactor.netty.NettyOutbound;
+import reactor.netty.tcp.TcpServer;
+
+import java.io.ByteArrayOutputStream;
+import java.net.InetSocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.List;
+import java.util.Locale;
+import java.util.concurrent.TimeUnit;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * IMAP server (RFC 3501) on Reactor Netty.
+ * <ul>
+ *   <li>{@link CommandDecoder} collects whole commands with their literals ({n} — after "+ Ready", {n+} — at once);</li>
+ *   <li>each command runs on a worker thread (database, MIME parsing), never on the event loop; responses are written
+ *       in order, one command at a time;</li>
+ *   <li>TLS: STARTTLS, or implicit TLS on a separate port (993); LOGIN/AUTHENTICATE only inside TLS unless
+ *       {@code authWithoutTls}; plain text sent together with STARTTLS is never executed;</li>
+ *   <li>IDLE: changes of the selected mailbox are pushed every {@code idlePoll} until DONE.</li>
+ * </ul>
+ */
+public class ImapServer {
+
+    private static final Logger log = LoggerFactory.getLogger(ImapServer.class);
+
+    static final int MAX_LINE = 64 * 1024;
+    private static final int MAX_QUEUED = 1000;
+    private static final Pattern LITERAL = Pattern.compile("\\{(\\d+)(\\+?)}\r?\n$");
+    private static final Pattern IDLE = Pattern.compile("^(\\S+) IDLE\\s*$", Pattern.CASE_INSENSITIVE);
+    private static final Duration IDLE_MAX = Duration.ofMinutes(29);
+
+    /**
+     * @param tls            certificate; null — no TLS
+     * @param implicitTls    TLS from the first byte (port 993)
+     * @param maxLiteral     the largest literal accepted (APPEND of a big message)
+     * @param idlePoll       how often IDLE looks for changes
+     */
+    public record Settings(String host, int port, String hostname, boolean authWithoutTls, SslContext tls,
+                           boolean implicitTls, int maxLiteral, Duration idleTimeout, Duration idlePoll) {
+    }
+
+    /** A whole command and whether it arrived over TLS. */
+    record Command(byte[] bytes, boolean tls) {
+    }
+
+    private final Settings settings;
+    private final ImapStore store;
+    private final LoginGuard guard;
+    private DisposableServer server;
+
+    public ImapServer(Settings settings, ImapStore store) {
+        this(settings, store, LoginGuard.disabled());
+    }
+
+    public ImapServer(Settings settings, ImapStore store, LoginGuard guard) {
+        this.settings = settings;
+        this.store = store;
+        this.guard = guard;
+    }
+
+    public void start() {
+        if (settings.implicitTls() && settings.tls() == null) {
+            throw new IllegalStateException("Implicit TLS needs a certificate");
+        }
+        TcpServer tcp = TcpServer.create()
+                .host(settings.host())
+                .port(settings.port())
+                .doOnConnection(connection -> connection
+                        .addHandlerFirst("imap-idle", new ReadTimeoutHandler(settings.idleTimeout().toSeconds(), TimeUnit.SECONDS))
+                        .addHandlerLast("imap-commands", new CommandDecoder(settings.maxLiteral())));
+        if (settings.implicitTls()) {
+            tcp = tcp.secure(spec -> spec.sslContext(settings.tls()));
+        }
+        server = tcp.handle((inbound, outbound) -> {
+                    Connection[] connection = {null};
+                    String[] remoteIp = {"unknown"};
+                    inbound.withConnection(c -> {
+                        connection[0] = c;
+                        if (c.address() instanceof InetSocketAddress address && address.getAddress() != null) {
+                            remoteIp[0] = address.getAddress().getHostAddress();
+                        }
+                    });
+                    ImapSession session = new ImapSession(
+                            new ImapSession.Settings(settings.hostname(), settings.tls() != null, settings.authWithoutTls()),
+                            store, guard, remoteIp[0], settings.implicitTls());
+                    @SuppressWarnings("unchecked")
+                    Sinks.Empty<Void>[] idleDone = new Sinks.Empty[1];
+
+                    Flux<byte[]> responses = inbound.receiveObject().cast(Command.class)
+                            // DONE ends IDLE while the IDLE command is still running — handled before the queue
+                            .filter(command -> {
+                                if (session.idling() && isDone(command.bytes())) {
+                                    if (idleDone[0] != null) {
+                                        idleDone[0].tryEmitEmpty();
+                                    }
+                                    return false;
+                                }
+                                return true;
+                            })
+                            // read commands as they come (so DONE is seen during IDLE), run them one by one
+                            .onBackpressureBuffer(MAX_QUEUED, dropped -> log.warn("IMAP {}: too many queued commands", session.remoteIp))
+                            .concatMap(command -> {
+                                if (session.tls && !command.tls()) {
+                                    // plain text sent together with STARTTLS: never executed, the connection is closed
+                                    log.warn("IMAP {}: plain-text command after STARTTLS, closing", session.remoteIp);
+                                    session.closing = true;
+                                    connection[0].dispose();
+                                    return Flux.empty();
+                                }
+                                String text = new String(command.bytes(), StandardCharsets.UTF_8).trim();
+                                Matcher idle = IDLE.matcher(text);
+                                if (idle.matches()) {
+                                    idleDone[0] = Sinks.empty();
+                                    return idle(session, idle.group(1), idleDone[0]);
+                                }
+                                return blocking(() -> session.handle(command.bytes()));
+                            })
+                            .onErrorResume(e -> {
+                                log.debug("IMAP {}: connection closed: {}", session.remoteIp, e.toString());
+                                return Mono.just(ImapSession.line("* BYE " + e.getMessage()));
+                            })
+                            // after the tagged line of the command that closes (LOGOUT, too many failed logins), not after
+                            // its first untagged "* BYE" — the tagged answer must still reach the client
+                            .takeUntil(response -> session.closing && !untagged(response));
+
+                    return Flux.concat(Mono.just(session.greeting()), responses)
+                            .concatMap(response -> response == ImapSession.STARTTLS_READY
+                                    ? startTls(connection[0], session)
+                                    : send(outbound, response))
+                            .then();
+                })
+                .bindNow(Duration.ofSeconds(10));
+        log.info("IMAP server listening on {}:{} ({}{})", settings.host(), port(), settings.hostname(),
+                settings.implicitTls() ? ", implicit TLS" : settings.tls() != null ? ", STARTTLS" : ", no TLS");
+    }
+
+    private Flux<byte[]> idle(ImapSession session, String tag, Sinks.Empty<Void> done) {
+        Flux<byte[]> polls = Flux.interval(settings.idlePoll())
+                .onBackpressureDrop()
+                .concatMap(tick -> blocking(session::idlePoll))
+                .takeUntilOther(done.asMono())
+                .take(IDLE_MAX);
+        return Flux.concat(
+                blocking(() -> session.idleStart(tag)),
+                Flux.defer(() -> session.idling() ? polls : Flux.empty()),
+                blocking(session::idleEnd));
+    }
+
+    private static boolean isDone(byte[] bytes) {
+        return new String(bytes, StandardCharsets.US_ASCII).trim().toUpperCase(Locale.ROOT).equals("DONE");
+    }
+
+    private static boolean untagged(byte[] response) {
+        return response.length > 1 && response[0] == '*' && response[1] == ' ';
+    }
+
+    private static Flux<byte[]> blocking(java.util.concurrent.Callable<List<byte[]>> work) {
+        return Mono.fromCallable(work).subscribeOn(Schedulers.boundedElastic()).flatMapIterable(list -> list);
+    }
+
+    private static Mono<Void> send(NettyOutbound outbound, byte[] response) {
+        return outbound.send(Mono.just(Unpooled.wrappedBuffer(response))).then();
+    }
+
+    /** After the tagged OK of STARTTLS has left in plain text: TLS in front, a fresh decoder (no plain leftovers). */
+    private Mono<Void> startTls(Connection connection, ImapSession session) {
+        ChannelPipeline pipeline = connection.channel().pipeline();
+        SslHandler ssl = settings.tls().newHandler(connection.channel().alloc());
+        pipeline.replace("imap-commands", "imap-commands", new CommandDecoder(settings.maxLiteral()));
+        pipeline.addFirst("imap-tls", ssl);
+        return Mono.create(sink -> ssl.handshakeFuture().addListener(future -> {
+            if (!future.isSuccess()) {
+                log.info("IMAP {}: TLS handshake failed: {}", session.remoteIp, future.cause().toString());
+                session.closing = true;
+                connection.dispose();
+            }
+            sink.success();
+        }));
+    }
+
+    public int port() {
+        return server.port();
+    }
+
+    public void stop() {
+        if (server != null) {
+            server.disposeNow(Duration.ofSeconds(5));
+        }
+    }
+
+    /**
+     * Collects one command: lines plus the literals they announce. A synchronizing literal {n} gets "+ Ready" first;
+     * {n+} (LITERAL+) is read at once. Marks whether the command was read behind TLS.
+     */
+    static final class CommandDecoder extends ByteToMessageDecoder {
+        private final int maxLiteral;
+        private final ByteArrayOutputStream command = new ByteArrayOutputStream();
+        private int literalLeft;
+        private int lineBytes;
+
+        CommandDecoder(int maxLiteral) {
+            this.maxLiteral = maxLiteral;
+        }
+
+        @Override
+        protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
+            while (in.isReadable()) {
+                if (literalLeft > 0) {
+                    int n = Math.min(literalLeft, in.readableBytes());
+                    byte[] chunk = new byte[n];
+                    in.readBytes(chunk);
+                    command.write(chunk, 0, n);
+                    literalLeft -= n;
+                    continue;
+                }
+                int newline = in.indexOf(in.readerIndex(), in.writerIndex(), (byte) '\n');
+                if (newline < 0) {
+                    if (lineBytes + in.readableBytes() > MAX_LINE) {
+                        throw new TooLongFrameException("Command line too long");
+                    }
+                    return;
+                }
+                int length = newline - in.readerIndex() + 1;
+                if (lineBytes + length > MAX_LINE) {
+                    throw new TooLongFrameException("Command line too long");
+                }
+                byte[] line = new byte[length];
+                in.readBytes(line);
+                command.write(line, 0, line.length);
+                lineBytes += length;
+                Matcher literal = LITERAL.matcher(new String(line, StandardCharsets.ISO_8859_1));
+                if (literal.find()) {
+                    long size = Long.parseLong(literal.group(1));
+                    if (size > maxLiteral) {
+                        ctx.writeAndFlush(Unpooled.copiedBuffer("* BYE Literal too large\r\n", StandardCharsets.US_ASCII));
+                        throw new TooLongFrameException("Literal too large: " + size);
+                    }
+                    literalLeft = (int) size;
+                    if (literal.group(2).isEmpty()) {
+                        ctx.writeAndFlush(Unpooled.copiedBuffer("+ Ready for literal data\r\n", StandardCharsets.US_ASCII));
+                    }
+                    continue;
+                }
+                out.add(new Command(command.toByteArray(), ctx.pipeline().get(SslHandler.class) != null));
+                command.reset();
+                lineBytes = 0;
+            }
+        }
+    }
+}

backend/src/main/java/com/mailserver/imap/ImapStore.java

@@ -0,0 +1,91 @@
+package com.mailserver.imap;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Mailboxes and messages as IMAP sees them. Blocking: the IMAP server calls it from a worker thread,
+ * never from the network event loop.
+ */
+public interface ImapStore {
+
+    /** A refusal the client sees as "NO reason". */
+    final class Refused extends RuntimeException {
+        public Refused(String reason) {
+            super(reason);
+        }
+    }
+
+    record Account(long userId, String email) {
+    }
+
+    record Mailbox(long id, String name, boolean system, long uidValidity, long uidNext) {
+
+        boolean isInbox() {
+            return system && "INBOX".equalsIgnoreCase(name);
+        }
+
+        boolean isDrafts() {
+            return system && "Drafts".equals(name);
+        }
+
+        /** RFC 6154 attribute, or null. */
+        String specialUse() {
+            if (!system) {
+                return null;
+            }
+            return switch (name) {
+                case "Drafts" -> "\\Drafts";
+                case "Sent" -> "\\Sent";
+                case "Spam" -> "\\Junk";
+                case "Trash" -> "\\Trash";
+                default -> null;
+            };
+        }
+
+        boolean named(String other) {
+            return isInbox() ? "INBOX".equalsIgnoreCase(other) : name.toLowerCase(Locale.ROOT).equals(other.toLowerCase(Locale.ROOT));
+        }
+    }
+
+    record Entry(long id, long uid, boolean seen, boolean flagged, boolean answered, boolean deleted, Instant internalDate) {
+
+        Entry withFlags(boolean seen, boolean flagged, boolean answered, boolean deleted) {
+            return new Entry(id, uid, seen, flagged, answered, deleted, internalDate);
+        }
+    }
+
+    /** null — wrong user or password. */
+    Account authenticate(String username, String password);
+
+    List<Mailbox> mailboxes(long userId);
+
+    Mailbox create(long userId, String name);
+
+    void rename(long userId, Mailbox mailbox, String newName);
+
+    /** An own folder: its messages go to the Trash (as in the web client), then the folder is removed. */
+    void delete(long userId, Mailbox mailbox);
+
+    /** Messages of the folder in UID order. */
+    List<Entry> entries(long folderId);
+
+    /** The full MIME text of the message (the original one, or built once and kept). */
+    byte[] source(long messageId);
+
+    void setFlags(long messageId, boolean seen, boolean flagged, boolean answered, boolean deleted);
+
+    /** Stores the message into the folder; returns its UID. */
+    long append(long userId, Mailbox target, byte[] raw, boolean seen, boolean flagged, boolean answered,
+                boolean deleted, Instant internalDate);
+
+    /** Copies; returns the new UIDs in the same order. */
+    List<Long> copy(long userId, List<Entry> messages, Mailbox target);
+
+    /** Moves; returns the new UIDs in the same order. */
+    List<Long> move(long userId, List<Entry> messages, Mailbox target);
+
+    /** Removes the messages for good (with attachment files). */
+    void expunge(List<Long> messageIds);
+}

backend/src/main/java/com/mailserver/imap/ImapWriter.java

@@ -0,0 +1,255 @@
+package com.mailserver.imap;
+
+import jakarta.mail.internet.AddressException;
+import jakarta.mail.internet.ContentDisposition;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeUtility;
+import jakarta.mail.internet.ParameterList;
+import jakarta.mail.internet.ParseException;
+
+import java.io.ByteArrayOutputStream;
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
+import java.util.Enumeration;
+import java.util.Locale;
+
+/** Builds IMAP response bytes: strings, literals, ENVELOPE, BODYSTRUCTURE (RFC 3501 7.4.2). */
+final class ImapWriter {
+
+    private final ByteArrayOutputStream out = new ByteArrayOutputStream();
+
+    ImapWriter text(String text) {
+        byte[] bytes = text.getBytes(StandardCharsets.UTF_8);
+        out.write(bytes, 0, bytes.length);
+        return this;
+    }
+
+    ImapWriter sp() {
+        out.write(' ');
+        return this;
+    }
+
+    ImapWriter crlf() {
+        return text("\r\n");
+    }
+
+    ImapWriter literal(byte[] bytes) {
+        text("{" + bytes.length + "}\r\n");
+        out.write(bytes, 0, bytes.length);
+        return this;
+    }
+
+    /** Quoted when it is plain ASCII without CR/LF, a literal otherwise; null → NIL. */
+    ImapWriter nstring(String value) {
+        if (value == null) {
+            return text("NIL");
+        }
+        return string(value);
+    }
+
+    ImapWriter string(String value) {
+        boolean quotable = value.length() < 1024;
+        for (int i = 0; i < value.length() && quotable; i++) {
+            char c = value.charAt(i);
+            if (c > 0x7e || c < 0x20) {
+                quotable = false;
+            }
+        }
+        if (!quotable) {
+            return literal(value.getBytes(StandardCharsets.UTF_8));
+        }
+        return text("\"" + value.replace("\\", "\\\\").replace("\"", "\\\"") + "\"");
+    }
+
+    byte[] bytes() {
+        return out.toByteArray();
+    }
+
+    // ---------- ENVELOPE ----------
+
+    ImapWriter envelope(MimeTree message) {
+        text("(");
+        nstring(message.header("Date")).sp();
+        nstring(message.header("Subject")).sp();
+        String from = message.header("From");
+        addresses(from).sp();
+        addresses(firstNonNull(message.header("Sender"), from)).sp();
+        addresses(firstNonNull(message.header("Reply-To"), from)).sp();
+        addresses(message.header("To")).sp();
+        addresses(message.header("Cc")).sp();
+        addresses(message.header("Bcc")).sp();
+        nstring(message.header("In-Reply-To")).sp();
+        nstring(message.header("Message-ID"));
+        return text(")");
+    }
+
+    private ImapWriter addresses(String header) {
+        if (header == null || header.isBlank()) {
+            return text("NIL");
+        }
+        InternetAddress[] list;
+        try {
+            list = InternetAddress.parseHeader(header, false);
+        } catch (AddressException e) {
+            return text("NIL");
+        }
+        if (list.length == 0) {
+            return text("NIL");
+        }
+        text("(");
+        for (InternetAddress address : list) {
+            String email = address.getAddress() == null ? "" : address.getAddress();
+            int at = email.lastIndexOf('@');
+            text("(");
+            nstring(encodedPersonal(address.getPersonal())).sp().text("NIL").sp();
+            nstring(at > 0 ? email.substring(0, at) : email).sp();
+            nstring(at > 0 ? email.substring(at + 1) : null);
+            text(")");
+        }
+        return text(")");
+    }
+
+    private static String encodedPersonal(String personal) {
+        if (personal == null) {
+            return null;
+        }
+        try {
+            return MimeUtility.encodeWord(personal, "UTF-8", "B");
+        } catch (UnsupportedEncodingException e) {
+            return personal;
+        }
+    }
+
+    // ---------- BODYSTRUCTURE / BODY ----------
+
+    ImapWriter bodyStructure(MimeTree part, boolean extensible) {
+        text("(");
+        if (part.isMultipart() && !part.children.isEmpty()) {
+            for (MimeTree child : part.children) {
+                bodyStructure(child, extensible);
+            }
+            sp().string(part.type.getSubType().toUpperCase(Locale.ROOT));
+            if (extensible) {
+                sp().params(part.type.getParameterList()).sp();
+                disposition(part).sp().text("NIL NIL");
+            }
+            return text(")");
+        }
+        String primary = part.isMultipart() ? "TEXT" : part.type.getPrimaryType().toUpperCase(Locale.ROOT);
+        String sub = part.isMultipart() ? "PLAIN" : part.type.getSubType().toUpperCase(Locale.ROOT);
+        string(primary).sp().string(sub).sp();
+        params(part.type.getParameterList()).sp();
+        nstring(part.header("Content-ID")).sp();
+        nstring(part.header("Content-Description")).sp();
+        String encoding = part.header("Content-Transfer-Encoding");
+        string(encoding == null ? "7BIT" : encoding.toUpperCase(Locale.ROOT)).sp();
+        text(String.valueOf(part.bodySize()));
+        if ("TEXT".equals(primary)) {
+            sp().text(String.valueOf(part.bodyLines()));
+        } else if (part.message != null) {
+            sp().envelope(part.message).sp().bodyStructure(part.message, extensible).sp().text(String.valueOf(part.bodyLines()));
+        }
+        if (extensible) {
+            sp().nstring(part.header("Content-MD5")).sp();
+            disposition(part).sp();
+            nstring(part.header("Content-Language")).sp();
+            nstring(part.header("Content-Location"));
+        }
+        return text(")");
+    }
+
+    private ImapWriter params(ParameterList params) {
+        if (params == null || params.size() == 0) {
+            return text("NIL");
+        }
+        text("(");
+        boolean first = true;
+        Enumeration<String> names = params.getNames();
+        while (names.hasMoreElements()) {
+            String name = names.nextElement();
+            if (!first) {
+                sp();
+            }
+            first = false;
+            string(name.toUpperCase(Locale.ROOT)).sp().string(String.valueOf(params.get(name)));
+        }
+        return text(")");
+    }
+
+    private ImapWriter disposition(MimeTree part) {
+        String header = part.header("Content-Disposition");
+        if (header == null) {
+            return text("NIL");
+        }
+        try {
+            ContentDisposition disposition = new ContentDisposition(header);
+            text("(").string(disposition.getDisposition().toUpperCase(Locale.ROOT)).sp();
+            params(disposition.getParameterList());
+            return text(")");
+        } catch (ParseException e) {
+            return text("NIL");
+        }
+    }
+
+    private static String firstNonNull(String a, String b) {
+        return a != null ? a : b;
+    }
+
+    // ---------- modified UTF-7 (RFC 3501 5.1.3) for mailbox names ----------
+
+    static String encodeMailbox(String name) {
+        StringBuilder out = new StringBuilder();
+        StringBuilder pending = new StringBuilder();
+        for (int i = 0; i < name.length(); i++) {
+            char c = name.charAt(i);
+            if (c >= 0x20 && c <= 0x7e) {
+                flushBase64(out, pending);
+                out.append(c == '&' ? "&-" : String.valueOf(c));
+            } else {
+                pending.append(c);
+            }
+        }
+        flushBase64(out, pending);
+        return out.toString();
+    }
+
+    private static void flushBase64(StringBuilder out, StringBuilder pending) {
+        if (pending.length() == 0) {
+            return;
+        }
+        byte[] utf16 = pending.toString().getBytes(StandardCharsets.UTF_16BE);
+        String base64 = java.util.Base64.getEncoder().withoutPadding().encodeToString(utf16).replace('/', ',');
+        out.append('&').append(base64).append('-');
+        pending.setLength(0);
+    }
+
+    static String decodeMailbox(String name) {
+        StringBuilder out = new StringBuilder();
+        int i = 0;
+        while (i < name.length()) {
+            char c = name.charAt(i);
+            if (c != '&') {
+                out.append(c);
+                i++;
+                continue;
+            }
+            int dash = name.indexOf('-', i);
+            if (dash < 0) {
+                out.append(name.substring(i));
+                break;
+            }
+            if (dash == i + 1) {
+                out.append('&');
+            } else {
+                try {
+                    byte[] utf16 = java.util.Base64.getDecoder().decode(name.substring(i + 1, dash).replace(',', '/'));
+                    out.append(new String(utf16, StandardCharsets.UTF_16BE));
+                } catch (IllegalArgumentException e) {
+                    out.append(name, i, dash + 1);
+                }
+            }
+            i = dash + 1;
+        }
+        return out.toString();
+    }
+}

backend/src/main/java/com/mailserver/imap/MimeSource.java

@@ -0,0 +1,129 @@
+package com.mailserver.imap;
+
+import com.mailserver.domain.Attachment;
+import com.mailserver.domain.Message;
+import jakarta.activation.DataHandler;
+import jakarta.activation.FileDataSource;
+import jakarta.mail.MessagingException;
+import jakarta.mail.Session;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeBodyPart;
+import jakarta.mail.internet.MimeMessage;
+import jakarta.mail.internet.MimeMultipart;
+import jakarta.mail.internet.MimeUtility;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.Properties;
+
+/**
+ * MIME text of a message that has no original (written in the web client): built from the stored fields and
+ * attachment files. The boundary and Message-ID come from the message id, so the result is the same every time.
+ */
+public final class MimeSource {
+
+    private MimeSource() {
+    }
+
+    public static byte[] build(Message message, List<Attachment> attachments, String hostname)
+            throws MessagingException, IOException {
+        Properties props = new Properties();
+        props.put("mail.mime.splitlongparameters", "true");
+        Session session = Session.getInstance(props);
+        String messageId = message.getMessageId() == null || message.getMessageId().isBlank()
+                ? message.getId() + "@" + hostname
+                : message.getMessageId().replaceAll("^<|>$", "");
+        if (!messageId.contains("@")) {
+            messageId = messageId + "@" + hostname;
+        }
+        String finalMessageId = "<" + messageId + ">";
+        MimeMessage mime = new MimeMessage(session) {
+            @Override
+            protected void updateMessageID() throws MessagingException {
+                setHeader("Message-ID", finalMessageId);
+            }
+        };
+
+        String from = message.getSenderEmail() == null ? "unknown@" + hostname : message.getSenderEmail();
+        mime.setFrom(new InternetAddress(from, message.getSenderName(), "UTF-8"));
+        List<InternetAddress> to = addresses(message.getRecipientEmail());
+        if (!to.isEmpty()) {
+            mime.setRecipients(jakarta.mail.Message.RecipientType.TO, to.toArray(new InternetAddress[0]));
+        }
+        List<InternetAddress> cc = addresses(message.getCcEmail());
+        if (!cc.isEmpty()) {
+            mime.setRecipients(jakarta.mail.Message.RecipientType.CC, cc.toArray(new InternetAddress[0]));
+        }
+        mime.setSubject(message.getSubject() == null ? "" : message.getSubject(), "UTF-8");
+        if (message.getReceivedAt() != null) {
+            mime.setSentDate(Date.from(message.getReceivedAt()));
+        }
+
+        String body = message.getBody() == null ? "" : message.getBody();
+        String subtype = message.isHtml() ? "html" : "plain";
+        if (attachments.isEmpty()) {
+            mime.setText(body, "UTF-8", subtype);
+        } else {
+            MimeMultipart mixed = new FixedBoundaryMultipart("mixed", "=_rms_" + message.getId());
+            MimeBodyPart text = new MimeBodyPart();
+            text.setText(body, "UTF-8", subtype);
+            mixed.addBodyPart(text);
+            for (Attachment attachment : attachments) {
+                Path file = Path.of(attachment.getFilePath());
+                if (!Files.isRegularFile(file)) {
+                    continue;
+                }
+                MimeBodyPart part = new MimeBodyPart();
+                FileDataSource source = new FileDataSource(file.toFile()) {
+                    @Override
+                    public String getContentType() {
+                        return attachment.getContentType() == null ? "application/octet-stream" : attachment.getContentType();
+                    }
+                };
+                part.setDataHandler(new DataHandler(source));
+                part.setFileName(MimeUtility.encodeText(attachment.getFilename(), "UTF-8", null));
+                part.setDisposition(attachment.getContentId() != null ? MimeBodyPart.INLINE : MimeBodyPart.ATTACHMENT);
+                if (attachment.getContentId() != null) {
+                    part.setContentID("<" + attachment.getContentId().replaceAll("^<|>$", "") + ">");
+                }
+                mixed.addBodyPart(part);
+            }
+            mime.setContent(mixed);
+        }
+        mime.saveChanges();
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        mime.writeTo(out);
+        return out.toByteArray();
+    }
+
+    private static List<InternetAddress> addresses(String list) {
+        List<InternetAddress> result = new ArrayList<>();
+        if (list == null || list.isBlank()) {
+            return result;
+        }
+        for (String one : list.split("[,;]")) {
+            String address = one.trim();
+            if (!address.isEmpty()) {
+                try {
+                    result.add(new InternetAddress(address));
+                } catch (MessagingException ignored) {
+                    // a broken address is left out, the message is still served
+                }
+            }
+        }
+        return result;
+    }
+
+    /** MimeMultipart with a given boundary instead of a random one. */
+    private static final class FixedBoundaryMultipart extends MimeMultipart {
+        FixedBoundaryMultipart(String subtype, String boundary) {
+            super(subtype);
+            this.contentType = "multipart/" + subtype + "; boundary=\"" + boundary + "\"";
+        }
+    }
+}

backend/src/main/java/com/mailserver/imap/MimeTree.java

@@ -0,0 +1,250 @@
+package com.mailserver.imap;
+
+import jakarta.mail.MessagingException;
+import jakarta.mail.internet.ContentType;
+import jakarta.mail.internet.InternetHeaders;
+import jakarta.mail.internet.ParseException;
+
+import java.io.ByteArrayInputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Locale;
+import java.util.Set;
+
+/**
+ * A message split into MIME parts by byte offsets — what IMAP needs for BODYSTRUCTURE and BODY[section]:
+ * every part is a range of the original bytes, so sizes and contents match BODY[] exactly.
+ */
+final class MimeTree {
+
+    private static final int MAX_DEPTH = 20;
+
+    final byte[] raw;
+    /** Part = [start, end); headers = [start, bodyStart), the blank line included. */
+    final int start;
+    final int bodyStart;
+    final int end;
+    final InternetHeaders headers;
+    final ContentType type;
+    final List<MimeTree> children;
+    /** The encapsulated message of a message/rfc822 part. */
+    final MimeTree message;
+
+    private MimeTree(byte[] raw, int start, int end, int depth) {
+        this.raw = raw;
+        this.start = start;
+        this.end = end;
+        this.bodyStart = headerEnd(raw, start, end);
+        this.headers = parseHeaders(raw, start, bodyStart);
+        this.type = contentType(headers);
+        List<MimeTree> parts = new ArrayList<>();
+        MimeTree nested = null;
+        if (depth < MAX_DEPTH) {
+            if (isMultipart()) {
+                String boundary = type.getParameter("boundary");
+                if (boundary != null && !boundary.isEmpty()) {
+                    split(boundary, depth, parts);
+                }
+            } else if (is("message", "rfc822") || is("message", "global")) {
+                nested = new MimeTree(raw, bodyStart, end, depth + 1);
+            }
+        }
+        this.children = Collections.unmodifiableList(parts);
+        this.message = nested;
+    }
+
+    static MimeTree parse(byte[] raw) {
+        return new MimeTree(raw, 0, raw.length, 0);
+    }
+
+    boolean isMultipart() {
+        return "multipart".equalsIgnoreCase(type.getPrimaryType());
+    }
+
+    boolean is(String primary, String sub) {
+        return primary.equalsIgnoreCase(type.getPrimaryType()) && sub.equalsIgnoreCase(type.getSubType());
+    }
+
+    byte[] all() {
+        return slice(start, end);
+    }
+
+    byte[] header() {
+        return slice(start, bodyStart);
+    }
+
+    byte[] body() {
+        return slice(bodyStart, end);
+    }
+
+    int bodySize() {
+        return end - bodyStart;
+    }
+
+    /** Lines of the body (for text parts in BODYSTRUCTURE). */
+    int bodyLines() {
+        int lines = 0;
+        for (int i = bodyStart; i < end; i++) {
+            if (raw[i] == '\n') {
+                lines++;
+            }
+        }
+        if (end > bodyStart && raw[end - 1] != '\n') {
+            lines++;
+        }
+        return lines;
+    }
+
+    /** Header value unfolded, or null. */
+    String header(String name) {
+        String[] values = headers.getHeader(name);
+        if (values == null || values.length == 0 || values[0] == null) {
+            return null;
+        }
+        return values[0].replaceAll("\r?\n(?=[ \t])", "").trim();
+    }
+
+    /** Only these header fields (or all but these), each with its folded lines, plus the blank line. */
+    byte[] headerFields(Set<String> names, boolean not) {
+        StringBuilder out = new StringBuilder();
+        String text = new String(raw, start, bodyStart - start, StandardCharsets.ISO_8859_1);
+        String[] lines = text.split("\r?\n", -1);
+        boolean keep = false;
+        for (String line : lines) {
+            if (line.isEmpty()) {
+                continue;
+            }
+            if (line.charAt(0) == ' ' || line.charAt(0) == '\t') {
+                if (keep) {
+                    out.append(line).append("\r\n");
+                }
+                continue;
+            }
+            int colon = line.indexOf(':');
+            String name = colon > 0 ? line.substring(0, colon).trim().toUpperCase(Locale.ROOT) : "";
+            keep = names.contains(name) != not;
+            if (keep) {
+                out.append(line).append("\r\n");
+            }
+        }
+        out.append("\r\n");
+        return out.toString().getBytes(StandardCharsets.ISO_8859_1);
+    }
+
+    private byte[] slice(int from, int to) {
+        byte[] copy = new byte[Math.max(0, to - from)];
+        System.arraycopy(raw, from, copy, 0, copy.length);
+        return copy;
+    }
+
+    /** Body parts between "--boundary" lines; the CRLF before a delimiter belongs to the delimiter. */
+    private void split(String boundary, int depth, List<MimeTree> parts) {
+        byte[] delimiter = ("--" + boundary).getBytes(StandardCharsets.ISO_8859_1);
+        int partStart = -1;
+        int i = bodyStart;
+        while (i < end) {
+            int lineEnd = indexOf(raw, (byte) '\n', i, end);
+            int next = lineEnd < 0 ? end : lineEnd + 1;
+            if (startsWith(raw, i, end, delimiter)) {
+                int after = i + delimiter.length;
+                boolean close = after + 1 < end && raw[after] == '-' && raw[after + 1] == '-';
+                if (partStart >= 0) {
+                    int partEnd = i;
+                    if (partEnd > partStart && raw[partEnd - 1] == '\n') {
+                        partEnd--;
+                        if (partEnd > partStart && raw[partEnd - 1] == '\r') {
+                            partEnd--;
+                        }
+                    }
+                    parts.add(new MimeTree(raw, partStart, Math.max(partStart, partEnd), depth + 1));
+                }
+                if (close) {
+                    return;
+                }
+                partStart = next;
+            }
+            i = next;
+        }
+        if (partStart >= 0 && partStart < end) { // no closing delimiter — take the rest
+            parts.add(new MimeTree(raw, partStart, end, depth + 1));
+        }
+    }
+
+    private static int headerEnd(byte[] raw, int start, int end) {
+        if (start < end && raw[start] == '\n') {
+            return start + 1;
+        }
+        if (start + 1 < end && raw[start] == '\r' && raw[start + 1] == '\n') {
+            return start + 2;
+        }
+        for (int i = start; i < end; i++) {
+            if (raw[i] == '\n') {
+                if (i + 1 < end && raw[i + 1] == '\n') {
+                    return i + 2;
+                }
+                if (i + 2 < end && raw[i + 1] == '\r' && raw[i + 2] == '\n') {
+                    return i + 3;
+                }
+            }
+        }
+        return end; // headers only
+    }
+
+    private static InternetHeaders parseHeaders(byte[] raw, int start, int end) {
+        try {
+            return new InternetHeaders(new ByteArrayInputStream(raw, start, end - start));
+        } catch (MessagingException e) {
+            return new InternetHeaders();
+        }
+    }
+
+    private static ContentType contentType(InternetHeaders headers) {
+        String[] values = headers.getHeader("Content-Type");
+        if (values != null && values.length > 0 && values[0] != null) {
+            try {
+                return new ContentType(values[0].replaceAll("\r?\n(?=[ \t])", "").trim());
+            } catch (ParseException ignored) {
+                // broken header — the RFC 2045 default
+            }
+        }
+        try {
+            return new ContentType("text/plain; charset=us-ascii");
+        } catch (ParseException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    private static boolean startsWith(byte[] raw, int at, int end, byte[] prefix) {
+        if (at + prefix.length > end) {
+            return false;
+        }
+        for (int i = 0; i < prefix.length; i++) {
+            if (raw[at + i] != prefix[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private static int indexOf(byte[] raw, byte value, int from, int end) {
+        for (int i = from; i < end; i++) {
+            if (raw[i] == value) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    /** Header names of the part, for tests and debugging. */
+    List<String> headerNames() {
+        List<String> names = new ArrayList<>();
+        Enumeration<jakarta.mail.Header> all = headers.getAllHeaders();
+        while (all.hasMoreElements()) {
+            names.add(all.nextElement().getName());
+        }
+        return names;
+    }
+}

backend/src/main/java/com/mailserver/repository/AttachmentRepository.java

@@ -1,9 +1,22 @@
 package com.mailserver.repository;
 
 import com.mailserver.domain.Attachment;
+import org.springframework.data.r2dbc.repository.Modifying;
+import org.springframework.data.r2dbc.repository.Query;
 import org.springframework.data.r2dbc.repository.R2dbcRepository;
 import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
 
 public interface AttachmentRepository extends R2dbcRepository<Attachment, Long> {
     Flux<Attachment> findByMessageId(Long messageId);
+
+    Mono<Long> countByMessageId(Long messageId);
+
+    @Modifying
+    @Query("UPDATE attachments SET message_id = :#{#to} WHERE message_id = :#{#from}")
+    Mono<Integer> moveAll(Long from, Long to);
+
+    @Query("SELECT COALESCE(SUM(a.size_bytes), 0) FROM attachments a JOIN messages m ON m.id = a.message_id " +
+           "JOIN folders f ON f.id = m.folder_id WHERE f.user_id = :#{#userId}")
+    Mono<Long> sumSizeByUserId(Long userId);
 }

backend/src/main/java/com/mailserver/repository/MessageRepository.java

@@ -2,6 +2,7 @@ package com.mailserver.repository;
 
 import com.mailserver.domain.Message;
 import org.springframework.data.domain.Pageable;
+import org.springframework.data.r2dbc.repository.Modifying;
 import org.springframework.data.r2dbc.repository.Query;
 import org.springframework.data.r2dbc.repository.R2dbcRepository;
 import reactor.core.publisher.Flux;
@@ -9,19 +10,29 @@ import reactor.core.publisher.Mono;
 
 public interface MessageRepository extends R2dbcRepository<Message, Long> {
 
-    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} ORDER BY received_at DESC")
-    Flux<Message> findByFolderId(Long folderId, Pageable pageable);
+    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} ORDER BY received_at DESC LIMIT :#{#limit}")
+    Flux<Message> findLatest(Long folderId, int limit);
+
+    Flux<Message> findByFolderId(Long folderId);
+
+    @Query("SELECT COUNT(*) FROM messages WHERE folder_id = :#{#folderId}")
+    Mono<Long> countByFolderId(Long folderId);
 
     @Query("SELECT COUNT(*) FROM messages WHERE folder_id = :#{#folderId} AND is_read = false")
     Mono<Long> countUnreadByFolderId(Long folderId);
 
-    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} AND is_read = false ORDER BY received_at DESC")
-    Flux<Message> findUnreadByFolderId(Long folderId, Pageable pageable);
+    @Modifying
+    @Query("UPDATE messages SET folder_id = :#{#to} WHERE folder_id = :#{#from}")
+    Mono<Integer> moveAll(Long from, Long to);
+
+    @Query("SELECT COALESCE(SUM(m.message_size), 0) FROM messages m JOIN folders f ON f.id = m.folder_id WHERE f.user_id = :#{#userId}")
+    Mono<Long> sumSizeByUserId(Long userId);
 
     @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} AND " +
            "(LOWER(subject) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
            "LOWER(sender_email) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
            "LOWER(sender_name) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
+           "LOWER(recipient_email) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
            "LOWER(body) LIKE '%' || LOWER(:#{#keyword}) || '%') " +
            "ORDER BY received_at DESC")
     Flux<Message> searchInFolder(Long folderId, String keyword, Pageable pageable);

backend/src/main/java/com/mailserver/security/LoginGuard.java

@@ -0,0 +1,257 @@
+package com.mailserver.security;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.scheduling.annotation.Scheduled;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayDeque;
+import java.util.Deque;
+import java.util.LinkedHashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Brute-force protection for every place that checks a password: SMTP AUTH, IMAP LOGIN/AUTHENTICATE, web login,
+ * password change. One instance is shared by all of them, so failures on SMTP and IMAP add up.
+ * <ul>
+ *   <li><b>By IP:</b> {@code maxPerIp} failures within {@code window} → the IP is blocked for {@code block};
+ *       each next block of the same IP is twice as long, up to {@code maxBlock}.</li>
+ *   <li><b>By mailbox:</b> {@code maxPerAccount} failures within {@code window} from any IPs (a distributed attack on
+ *       one mailbox) → the mailbox is blocked for {@code block} — but not for IPs that logged in to it successfully
+ *       before ({@code knownIpTtl}), so an attacker cannot lock the owner's own mail program out.</li>
+ * </ul>
+ * While blocked the password is not checked at all (no answer to a guess) and the caller gets {@link #retryAfter}.
+ * State is in memory: a restart forgets it, which is fine for minutes-long blocks.
+ */
+public class LoginGuard {
+
+    private static final Logger log = LoggerFactory.getLogger(LoginGuard.class);
+
+    /** Upper bound of tracked keys of each kind, so a flood of random usernames/IPs cannot eat the memory. */
+    static final int MAX_KEYS = 100_000;
+    private static final int MAX_KNOWN_IPS_PER_ACCOUNT = 20;
+
+    public record Settings(boolean enabled, int maxPerIp, int maxPerAccount, Duration window, Duration block,
+                           Duration maxBlock, Duration knownIpTtl, Set<String> trustedIps, Duration failureDelay) {
+
+        public static Settings defaults() {
+            return new Settings(true, 10, 20, Duration.ofMinutes(15), Duration.ofMinutes(15), Duration.ofHours(24),
+                    Duration.ofDays(30), Set.of(), Duration.ofSeconds(1));
+        }
+    }
+
+    /** Failures in the window, current block and how many times the key was blocked in a row. */
+    private static final class Counter {
+        final Deque<Instant> failures = new ArrayDeque<>();
+        volatile Instant blockedUntil = Instant.EPOCH;
+        int strikes;
+        Instant lastSeen = Instant.EPOCH;
+    }
+
+    private final Settings settings;
+    private final Clock clock;
+    private final Map<String, Counter> byIp = new ConcurrentHashMap<>();
+    private final Map<String, Counter> byAccount = new ConcurrentHashMap<>();
+    /** account → IPs that logged in to it successfully, with the time of the last success. */
+    private final Map<String, Map<String, Instant>> knownIps = new ConcurrentHashMap<>();
+
+    public LoginGuard(Settings settings) {
+        this(settings, Clock.systemUTC());
+    }
+
+    LoginGuard(Settings settings, Clock clock) {
+        this.settings = settings;
+        this.clock = clock;
+    }
+
+    /** Guard that never blocks (tests, closed networks). */
+    public static LoginGuard disabled() {
+        Settings d = Settings.defaults();
+        return new LoginGuard(new Settings(false, d.maxPerIp(), d.maxPerAccount(), d.window(), d.block(), d.maxBlock(),
+                d.knownIpTtl(), Set.of(), Duration.ZERO));
+    }
+
+    /** Pause before answering "wrong password": slows down guessing inside one connection. */
+    public Duration failureDelay() {
+        return settings.enabled() ? settings.failureDelay() : Duration.ZERO;
+    }
+
+    /**
+     * Zero when the attempt may go on and the password may be checked; otherwise how long the caller has to wait.
+     */
+    public Duration retryAfter(String ip, String account) {
+        if (!settings.enabled()) {
+            return Duration.ZERO;
+        }
+        Instant now = clock.instant();
+        Duration wait = Duration.ZERO;
+        if (!trusted(ip)) {
+            wait = remaining(byIp.get(ip), now);
+        }
+        String acc = normalize(account);
+        if (acc != null && !known(acc, ip, now)) {
+            Duration accountWait = remaining(byAccount.get(acc), now);
+            if (accountWait.compareTo(wait) > 0) {
+                wait = accountWait;
+            }
+        }
+        return wait;
+    }
+
+    public boolean blocked(String ip, String account) {
+        return !retryAfter(ip, account).isZero();
+    }
+
+    /** A wrong password (or an unknown mailbox). */
+    public void failure(String ip, String account) {
+        if (!settings.enabled()) {
+            return;
+        }
+        Instant now = clock.instant();
+        if (!trusted(ip)) {
+            count(byIp, ip, settings.maxPerIp(), now, "IP " + ip);
+        }
+        String acc = normalize(account);
+        if (acc != null) {
+            count(byAccount, acc, settings.maxPerAccount(), now, "mailbox " + acc);
+        }
+    }
+
+    /** A right password: the IP becomes known for the mailbox, failures of this IP are forgiven. */
+    public void success(String ip, String account) {
+        if (!settings.enabled()) {
+            return;
+        }
+        Instant now = clock.instant();
+        String acc = normalize(account);
+        if (acc != null) {
+            if (knownIps.size() < MAX_KEYS || knownIps.containsKey(acc)) {
+                knownIps.compute(acc, (k, ips) -> {
+                    Map<String, Instant> map = ips != null ? ips : new LinkedHashMap<>();
+                    synchronized (map) {
+                        map.remove(ip);
+                        map.put(ip, now);
+                        while (map.size() > MAX_KNOWN_IPS_PER_ACCOUNT) {
+                            map.remove(map.keySet().iterator().next());
+                        }
+                    }
+                    return map;
+                });
+            }
+        }
+        byIp.computeIfPresent(ip, (k, c) -> {
+            c.failures.clear();
+            return c.blockedUntil.isAfter(now) ? c : null;
+        });
+    }
+
+    /** Drops what expired; runs every minute. */
+    @Scheduled(fixedDelay = 60_000)
+    public void sweep() {
+        Instant now = clock.instant();
+        Instant idle = now.minus(settings.maxBlock()).minus(settings.window());
+        byIp.entrySet().removeIf(e -> stale(e.getValue(), now, idle));
+        byAccount.entrySet().removeIf(e -> stale(e.getValue(), now, idle));
+        Instant knownSince = now.minus(settings.knownIpTtl());
+        knownIps.entrySet().removeIf(e -> {
+            synchronized (e.getValue()) {
+                e.getValue().values().removeIf(t -> t.isBefore(knownSince));
+                return e.getValue().isEmpty();
+            }
+        });
+    }
+
+    int trackedIps() {
+        return byIp.size();
+    }
+
+    int trackedAccounts() {
+        return byAccount.size();
+    }
+
+    // ---------------------------------------------------------------------------------------------
+
+    private void count(Map<String, Counter> map, String key, int max, Instant now, String what) {
+        if (map.size() >= MAX_KEYS && !map.containsKey(key)) {
+            sweep();
+            if (map.size() >= MAX_KEYS) {
+                log.warn("login guard: {} keys tracked, {} not counted", map.size(), what);
+                return;
+            }
+        }
+        map.compute(key, (k, existing) -> {
+            Counter c = existing != null ? existing : new Counter();
+            c.lastSeen = now;
+            Instant from = now.minus(settings.window());
+            while (!c.failures.isEmpty() && c.failures.peekFirst().isBefore(from)) {
+                c.failures.pollFirst();
+            }
+            if (c.blockedUntil.isAfter(now)) {
+                return c; // already blocked: attempts are refused before the password check anyway
+            }
+            // A long quiet time after the last block forgives the strikes
+            if (c.strikes > 0 && c.blockedUntil.plus(settings.maxBlock()).isBefore(now)) {
+                c.strikes = 0;
+            }
+            c.failures.addLast(now);
+            if (c.failures.size() >= max) {
+                Duration block = settings.block().multipliedBy(1L << Math.min(c.strikes, 20));
+                if (block.compareTo(settings.maxBlock()) > 0) {
+                    block = settings.maxBlock();
+                }
+                c.strikes++;
+                c.blockedUntil = now.plus(block);
+                c.failures.clear();
+                log.warn("login guard: {} blocked for {} after {} failed logins (block #{})",
+                        what, human(block), max, c.strikes);
+            }
+            return c;
+        });
+    }
+
+    private static Duration remaining(Counter c, Instant now) {
+        if (c == null) {
+            return Duration.ZERO;
+        }
+        Instant until = c.blockedUntil;
+        return until.isAfter(now) ? Duration.between(now, until) : Duration.ZERO;
+    }
+
+    private boolean known(String account, String ip, Instant now) {
+        Map<String, Instant> ips = knownIps.get(account);
+        if (ips == null) {
+            return false;
+        }
+        synchronized (ips) {
+            Instant at = ips.get(ip);
+            return at != null && at.plus(settings.knownIpTtl()).isAfter(now);
+        }
+    }
+
+    private boolean trusted(String ip) {
+        return settings.trustedIps().contains(ip);
+    }
+
+    private static boolean stale(Counter c, Instant now, Instant idle) {
+        return !c.blockedUntil.isAfter(now) && c.lastSeen.isBefore(idle);
+    }
+
+    private static String normalize(String account) {
+        if (account == null) {
+            return null;
+        }
+        String acc = account.trim().toLowerCase(Locale.ROOT);
+        return acc.isEmpty() ? null : acc;
+    }
+
+    /** "15 min" / "2 h" for messages to the user. */
+    public static String human(Duration d) {
+        long minutes = Math.max(1, (d.toSeconds() + 59) / 60);
+        return minutes < 120 ? minutes + " min" : (minutes + 59) / 60 + " h";
+    }
+}

backend/src/main/java/com/mailserver/service/LocalDelivery.java

@@ -9,6 +9,7 @@ import jakarta.mail.Part;
 import jakarta.mail.Session;
 import jakarta.mail.internet.InternetAddress;
 import jakarta.mail.internet.MimeMessage;
+import jakarta.mail.internet.MimeUtility;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Value;
@@ -18,6 +19,8 @@ import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Properties;
 
 /**
@@ -35,9 +38,12 @@ public class LocalDelivery implements DeliveryWorker.BounceSender {
     private final SpfService spfService;
     private final DmarcService dmarcService;
     private final String hostname;
+    private final MessageSources sources;
 
     public LocalDelivery(MailService mailService, DkimService dkimService, SpfService spfService,
-                         DmarcService dmarcService, @Value("${mailserver.smtp.hostname:localhost}") String hostname) {
+                         DmarcService dmarcService, @Value("${mailserver.smtp.hostname:localhost}") String hostname,
+                         MessageSources sources) {
+        this.sources = sources;
         this.mailService = mailService;
         this.dkimService = dkimService;
         this.spfService = spfService;
@@ -71,7 +77,63 @@ public class LocalDelivery implements DeliveryWorker.BounceSender {
                     dkim.signed() ? (dkim.passed() ? "pass " + dkim.domain() : "fail") : "none", spf, dmarc, spam ? " → spam" : "");
         }
 
-        mailService.receiveMessage(senderEmail, senderName, mailbox, subject, body.text(), body.html(), spam).block();
+        com.mailserver.domain.Message stored =
+                mailService.receiveMessage(senderEmail, senderName, mailbox, subject, body.text(), body.html(), spam,
+                        addresses(mime, jakarta.mail.Message.RecipientType.TO),
+                        addresses(mime, jakarta.mail.Message.RecipientType.CC)).block();
+        if (stored != null) {
+            for (FilePart file : attachments(mime)) {
+                mailService.storeIncomingAttachment(stored.getId(), file.name(), file.contentType(), file.bytes());
+            }
+            // IMAP serves the message exactly as it arrived
+            sources.put(stored.getId(), raw).block();
+        }
+    }
+
+    /** "a@x, b@y" from a header, or null. A broken header is ignored, not a reason to lose the message. */
+    public static String addresses(MimeMessage mime, jakarta.mail.Message.RecipientType type) {
+        try {
+            jakarta.mail.Address[] list = mime.getRecipients(type);
+            if (list == null || list.length == 0) {
+                return null;
+            }
+            List<String> result = new ArrayList<>();
+            for (jakarta.mail.Address address : list) {
+                result.add(address instanceof InternetAddress internet ? internet.getAddress() : address.toString());
+            }
+            String joined = String.join(", ", result);
+            return joined.length() > 5000 ? joined.substring(0, 5000) : joined;
+        } catch (MessagingException e) {
+            return null;
+        }
+    }
+
+    public record FilePart(String name, String contentType, byte[] bytes) {
+    }
+
+    /** Parts with a file name (attachments and inline images), nested multiparts walked. */
+    public static List<FilePart> attachments(Part part) throws MessagingException, IOException {
+        List<FilePart> files = new ArrayList<>();
+        collect(part, files);
+        return files;
+    }
+
+    private static void collect(Part part, List<FilePart> files) throws MessagingException, IOException {
+        if (part.isMimeType("multipart/*") && part.getContent() instanceof Multipart multipart) {
+            for (int i = 0; i < multipart.getCount(); i++) {
+                collect(multipart.getBodyPart(i), files);
+            }
+            return;
+        }
+        String name = part.getFileName();
+        if (name == null && !Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
+            return;
+        }
+        String decoded = name == null ? "file" : MimeUtility.decodeText(name);
+        String type = part.getContentType() == null ? "application/octet-stream" : part.getContentType().split(";")[0].trim();
+        try (InputStream in = part.getInputStream()) {
+            files.add(new FilePart(decoded, type.toLowerCase(java.util.Locale.ROOT), in.readAllBytes()));
+        }
     }
 
     /** Non-delivery report into the sender's inbox — only when the sender is our mailbox. */
@@ -87,11 +149,11 @@ public class LocalDelivery implements DeliveryWorker.BounceSender {
         }
     }
 
-    record Body(String text, boolean html) {
+    public record Body(String text, boolean html) {
     }
 
     /** HTML part when the message has one, otherwise the plain text; nested multiparts are walked. */
-    static Body body(Part part) throws MessagingException, IOException {
+    public static Body body(Part part) throws MessagingException, IOException {
         String html = find(part, "text/html");
         if (html != null) {
             return new Body(html, true);
@@ -101,7 +163,7 @@ public class LocalDelivery implements DeliveryWorker.BounceSender {
     }
 
     private static String find(Part part, String type) throws MessagingException, IOException {
-        if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
+        if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition()) || part.getFileName() != null) {
             return null;
         }
         if (part.isMimeType(type)) {

backend/src/main/java/com/mailserver/service/MailService.java

@@ -6,6 +6,9 @@ import com.mailserver.domain.Folder;
 import com.mailserver.domain.Message;
 import com.mailserver.domain.User;
 import com.mailserver.dto.AttachmentResponse;
+import com.mailserver.dto.DraftRequest;
+import com.mailserver.dto.FolderResponse;
+import com.mailserver.dto.MessageUpdateRequest;
 import com.mailserver.dto.MessageResponse;
 import com.mailserver.repository.AttachmentRepository;
 import com.mailserver.repository.ContactRepository;
@@ -30,6 +33,8 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.time.Instant;
 import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.Locale;
 import java.util.List;
 import java.util.Properties;
 import java.util.UUID;
@@ -54,7 +59,8 @@ public class MailService {
     public MailService(MessageRepository messageRepository, FolderRepository folderRepository,
                        UserRepository userRepository, AttachmentRepository attachmentRepository,
                        ContactRepository contactRepository,
-                       SpamFilterService spamFilterService) {
+                       SpamFilterService spamFilterService, MessageSources sources) {
+        this.sources = sources;
         this.messageRepository = messageRepository;
         this.folderRepository = folderRepository;
         this.userRepository = userRepository;
@@ -63,16 +69,116 @@ public class MailService {
         this.spamFilterService = spamFilterService;
     }
 
+    /** System folders in the order the web client shows them; the rest — own folders, by name. */
+    private final MessageSources sources;
+
+    public static final List<String> SYSTEM_FOLDERS = List.of("INBOX", "Drafts", "Sent", "Spam", "Trash");
+
+    /** Messages per folder in one list — the web client sorts and pages them itself. */
+    public static final int LIST_LIMIT = 1000;
+
+    private static final int PREVIEW_CHARS = 200;
+
+    // --- Folders ---
+
+    public Flux<FolderResponse> folders(Long userId) {
+        return folderRepository.findByUserId(userId)
+                .flatMap(folder -> Mono.zip(messageRepository.countByFolderId(folder.getId()),
+                                messageRepository.countUnreadByFolderId(folder.getId()))
+                        .map(counts -> new FolderResponse(folder.getId(), folder.getName(), folder.isSystem(),
+                                counts.getT1(), counts.getT2())))
+                .sort(Comparator.comparingInt(MailService::folderOrder)
+                        .thenComparing(folder -> folder.name().toLowerCase(Locale.ROOT)));
+    }
+
+    private static int folderOrder(FolderResponse folder) {
+        int index = SYSTEM_FOLDERS.indexOf(folder.name());
+        return folder.system() && index >= 0 ? index : SYSTEM_FOLDERS.size();
+    }
+
+    public Mono<FolderResponse> createFolder(Long userId, String rawName) {
+        String name = folderName(rawName);
+        return checkFolderNameFree(userId, name, null)
+                .then(Mono.defer(() -> {
+                    Folder folder = new Folder();
+                    folder.setUserId(userId);
+                    folder.setName(name);
+                    folder.setCreatedAt(Instant.now());
+                    return folderRepository.save(folder);
+                }))
+                .map(folder -> new FolderResponse(folder.getId(), folder.getName(), false, 0, 0));
+    }
+
+    public Mono<Void> renameFolder(Long folderId, Long userId, String rawName) {
+        String name = folderName(rawName);
+        return ownFolder(folderId, userId)
+                .flatMap(folder -> checkFolderNameFree(userId, name, folder.getId())
+                        .then(Mono.defer(() -> {
+                            folder.setName(name);
+                            return folderRepository.save(folder);
+                        })))
+                .then();
+    }
+
+    /** An own folder: its messages go to the Trash, then the folder is removed. */
+    public Mono<Void> deleteFolder(Long folderId, Long userId) {
+        return ownFolder(folderId, userId)
+                .flatMap(folder -> systemFolder(userId, "Trash")
+                        .flatMap(trash -> messageRepository.moveAll(folder.getId(), trash.getId()))
+                        .then(folderRepository.delete(folder)));
+    }
+
+    /** Trash and Spam only: removes every message for good. */
+    public Mono<Integer> emptyFolder(Long folderId, Long userId) {
+        return ownedFolder(folderId, userId)
+                .filter(folder -> folder.isSystem() && ("Trash".equals(folder.getName()) || "Spam".equals(folder.getName())))
+                .switchIfEmpty(Mono.error(badRequest("Only Trash and Spam can be emptied")))
+                .flatMapMany(folder -> messageRepository.findByFolderId(folder.getId()))
+                .concatMap(message -> purge(message).thenReturn(1))
+                .reduce(0, Integer::sum);
+    }
+
+    private static String folderName(String rawName) {
+        String name = rawName == null ? "" : rawName.trim().replaceAll("\\s+", " ");
+        if (name.isEmpty() || name.length() > 50) {
+            throw badRequest("Folder name: 1 to 50 characters");
+        }
+        if (SYSTEM_FOLDERS.stream().anyMatch(name::equalsIgnoreCase)) {
+            throw badRequest("This name belongs to a system folder");
+        }
+        return name;
+    }
+
+    private Mono<Void> checkFolderNameFree(Long userId, String name, Long exceptId) {
+        return folderRepository.findByUserId(userId)
+                .filter(folder -> folder.getName().equalsIgnoreCase(name) && !folder.getId().equals(exceptId))
+                .hasElements()
+                .flatMap(taken -> taken ? Mono.error(badRequest("A folder with this name already exists")) : Mono.empty());
+    }
+
+    private Mono<Folder> ownFolder(Long folderId, Long userId) {
+        return ownedFolder(folderId, userId)
+                .filter(folder -> !folder.isSystem())
+                .switchIfEmpty(Mono.error(badRequest("System folders cannot be renamed or deleted")));
+    }
+
+    private Mono<Folder> systemFolder(Long userId, String name) {
+        return folderRepository.findByUserIdAndName(userId, name)
+                .switchIfEmpty(Mono.error(new IllegalStateException(name + " folder not found")));
+    }
+
+    // --- Messages ---
+
     /** Copy of a message we sent, in the sender's "Sent" folder. */
-    public Mono<MessageResponse> saveSent(User fromUser, String to, String subject, String body, boolean html, String messageId) {
-        return folderRepository.findByUserIdAndName(fromUser.getId(), "Sent")
-                .switchIfEmpty(Mono.error(new IllegalStateException("Sent folder not found")))
+    public Mono<Message> saveSent(User fromUser, String to, String cc, String subject, String body, boolean html, String messageId) {
+        return systemFolder(fromUser.getId(), "Sent")
                 .flatMap(sentFolder -> {
                     Message message = new Message();
                     message.setFolderId(sentFolder.getId());
                     message.setSenderEmail(fromUser.getEmail());
                     message.setSenderName(fromUser.getDisplayName());
                     message.setRecipientEmail(to);
+                    message.setCcEmail(cc == null || cc.isBlank() ? null : cc);
                     message.setSubject(subject);
                     message.setBody(body);
                     message.setHtml(html);
@@ -81,59 +187,114 @@ public class MailService {
                     message.setMessageId(messageId);
                     message.setMessageSize((long) (subject.length() + body.length()));
                     return messageRepository.save(message);
-                })
-                .map(this::toResponse);
+                });
     }
 
-    public Mono<Void> receiveMessage(String senderEmail, String senderName, String recipientEmail,
+    /** Creates or updates a draft of the user (only a message in their Drafts folder can be updated). */
+    public Mono<MessageResponse> saveDraft(User user, Long draftId, DraftRequest request) {
+        Mono<Message> target = draftId == null
+                ? systemFolder(user.getId(), "Drafts").map(drafts -> {
+                    Message message = new Message();
+                    message.setFolderId(drafts.getId());
+                    message.setRead(true);
+                    message.setMessageId(UUID.randomUUID().toString());
+                    return message;
+                })
+                : ownedDraft(draftId, user.getId());
+        return target.flatMap(message -> {
+                    String subject = request.subject() == null ? "" : request.subject();
+                    String body = request.body() == null ? "" : request.body();
+                    message.setSenderEmail(user.getEmail());
+                    message.setSenderName(user.getDisplayName());
+                    message.setRecipientEmail(request.to() == null ? "" : request.to().trim());
+                    message.setCcEmail(request.cc() == null || request.cc().isBlank() ? null : request.cc().trim());
+                    message.setSubject(subject);
+                    message.setBody(body);
+                    message.setHtml(request.html());
+                    message.setReceivedAt(Instant.now());
+                    message.setMessageSize((long) (subject.length() + body.length()));
+                    return messageRepository.save(message);
+                })
+                // IMAP: the draft changed — its MIME text is built anew
+                .flatMap(saved -> sources.remove(saved.getId()).thenReturn(saved))
+                .flatMap(this::withAttachmentCount);
+    }
+
+    /** The user's draft, or 404. */
+    public Mono<Message> ownedDraft(Long draftId, Long userId) {
+        return ownedMessage(draftId, userId)
+                .filterWhen(message -> folderRepository.findById(message.getFolderId())
+                        .map(folder -> folder.isSystem() && "Drafts".equals(folder.getName())))
+                .switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.NOT_FOUND, "Draft not found")));
+    }
+
+    /** After sending: the draft's attachments move to the copy in Sent, the draft itself is removed. */
+    public Mono<Void> finishDraft(Long draftId, Long sentMessageId) {
+        return attachmentRepository.moveAll(draftId, sentMessageId)
+                .then(sources.remove(sentMessageId))
+                .then(messageRepository.deleteById(draftId));
+    }
+
+    public Mono<Message> receiveMessage(String senderEmail, String senderName, String recipientEmail,
                                String subject, String body, boolean isHtml) {
         return receiveMessage(senderEmail, senderName, recipientEmail, subject, body, isHtml, false);
     }
 
-    public Mono<Void> receiveMessage(String senderEmail, String senderName, String recipientEmail,
+    public Mono<Message> receiveMessage(String senderEmail, String senderName, String recipientEmail,
                                String subject, String body, boolean isHtml, boolean externalSpamFlag) {
-        return userRepository.findByEmail(recipientEmail)
-                .switchIfEmpty(Mono.error(new IllegalArgumentException("Recipient not found: " + recipientEmail)))
-                .flatMap(recipient ->
-                    folderRepository.findByUserIdAndName(recipient.getId(), "INBOX")
-                        .switchIfEmpty(Mono.error(new IllegalStateException("INBOX not found")))
-                        .flatMap(inbox ->
-                            spamFilterService.isBlacklisted(recipient.getId(), senderEmail)
-                                .flatMap(isBlacklisted -> {
-                                    boolean isSpam = isBlacklisted || externalSpamFlag;
-                                    Message message = new Message();
-                                    message.setFolderId(inbox.getId());
-                                    message.setSenderEmail(senderEmail);
-                                    message.setSenderName(senderName);
-                                    message.setRecipientEmail(recipientEmail);
-                                    message.setSubject(subject);
-                                    message.setBody(body);
-                                    message.setHtml(isHtml);
-                                    message.setRead(false);
-                                    message.setSpam(isSpam);
-                                    message.setReceivedAt(Instant.now());
-                                    message.setMessageId(UUID.randomUUID().toString());
-                                    message.setMessageSize((long) (subject.length() + body.length()));
-                                    return messageRepository.save(message)
-                                        .then(folderRepository.save(inbox));
-                                })
-                        )
-                )
-                .then();
+        return receiveMessage(senderEmail, senderName, recipientEmail, subject, body, isHtml, externalSpamFlag, null, null);
     }
 
-    public Flux<MessageResponse> getMessages(Long folderId, Long userId, int page, int size) {
-        PageRequest pageable = PageRequest.of(page, size, Sort.by(Sort.Direction.DESC, "receivedAt"));
+    /**
+     * Stores an incoming message: into INBOX, or into Spam when it failed the checks or the sender is blacklisted.
+     * {@code toHeader}/{@code ccHeader}: addresses from the message headers (shown, used by "reply all");
+     * without them — the mailbox itself.
+     */
+    public Mono<Message> receiveMessage(String senderEmail, String senderName, String recipientEmail,
+                               String subject, String body, boolean isHtml, boolean externalSpamFlag,
+                               String toHeader, String ccHeader) {
+        return userRepository.findByEmail(recipientEmail)
+                .switchIfEmpty(Mono.error(new IllegalArgumentException("Recipient not found: " + recipientEmail)))
+                .flatMap(recipient -> spamFilterService.isBlacklisted(recipient.getId(), senderEmail)
+                        .flatMap(blacklisted -> {
+                            boolean isSpam = blacklisted || externalSpamFlag;
+                            return systemFolder(recipient.getId(), isSpam ? "Spam" : "INBOX")
+                                    .flatMap(folder -> {
+                                        Message message = new Message();
+                                        message.setFolderId(folder.getId());
+                                        message.setSenderEmail(senderEmail);
+                                        message.setSenderName(senderName);
+                                        message.setRecipientEmail(toHeader == null || toHeader.isBlank() ? recipientEmail : toHeader);
+                                        message.setCcEmail(ccHeader == null || ccHeader.isBlank() ? null : ccHeader);
+                                        message.setSubject(subject);
+                                        message.setBody(body);
+                                        message.setHtml(isHtml);
+                                        message.setRead(false);
+                                        message.setSpam(isSpam);
+                                        message.setReceivedAt(Instant.now());
+                                        message.setMessageId(UUID.randomUUID().toString());
+                                        message.setMessageSize((long) (subject.length() + body.length()));
+                                        return messageRepository.save(message);
+                                    });
+                        }));
+    }
+
+    /** Newest first; bodies cut to a preview — the full message comes from {@link #getMessage}. */
+    public Flux<MessageResponse> listMessages(Long folderId, Long userId, int limit) {
+        int safeLimit = Math.max(1, Math.min(limit, LIST_LIMIT));
         return ownedFolder(folderId, userId)
-                .flatMapMany(folder -> messageRepository.findByFolderId(folder.getId(), pageable))
-                .map(this::toResponse);
+                .flatMapMany(folder -> messageRepository.findLatest(folder.getId(), safeLimit))
+                .concatMap(this::withAttachmentCount)
+                .map(MailService::preview);
     }
 
     public Flux<MessageResponse> searchMessages(Long folderId, Long userId, String keyword, int page, int size) {
         PageRequest pageable = PageRequest.of(page, size, Sort.by(Sort.Direction.DESC, "receivedAt"));
         return ownedFolder(folderId, userId)
                 .flatMapMany(folder -> messageRepository.searchInFolder(folder.getId(), keyword, pageable))
-                .map(this::toResponse);
+                .take(LIST_LIMIT)
+                .concatMap(this::withAttachmentCount)
+                .map(MailService::preview);
     }
 
     public Flux<MessageResponse> searchMessagesWithFilters(Long folderId, Long userId,
@@ -143,23 +304,74 @@ public class MailService {
         PageRequest pageable = PageRequest.of(page, size, Sort.by(Sort.Direction.DESC, "receivedAt"));
         return ownedFolder(folderId, userId)
                 .flatMapMany(folder -> messageRepository.searchWithFilters(folder.getId(), subject, body, sender, recipient, pageable))
-                .map(this::toResponse);
+                .take(LIST_LIMIT)
+                .concatMap(this::withAttachmentCount)
+                .map(MailService::preview);
     }
 
     public Mono<MessageResponse> getMessage(Long messageId, Long userId) {
-        return ownedMessage(messageId, userId).map(this::toResponse);
+        return ownedMessage(messageId, userId).flatMap(this::withAttachmentCount);
     }
 
     public Mono<Void> markAsRead(Long messageId, Long userId) {
-        return ownedMessage(messageId, userId)
-                .flatMap(message -> {
-                    message.setRead(true);
-                    return messageRepository.save(message).then();
-                });
+        return updateMessage(messageId, userId, new MessageUpdateRequest(true, null, null)).then();
     }
 
+    /** Read/unread, flag, move to another folder of the user (moving into Spam marks it as spam, out of it — not). */
+    public Mono<MessageResponse> updateMessage(Long messageId, Long userId, MessageUpdateRequest update) {
+        return ownedMessage(messageId, userId)
+                .flatMap(message -> {
+                    if (update.read() != null) {
+                        message.setRead(update.read());
+                    }
+                    if (update.flagged() != null) {
+                        message.setFlagged(update.flagged());
+                    }
+                    if (update.folderId() == null || update.folderId().equals(message.getFolderId())) {
+                        return messageRepository.save(message);
+                    }
+                    return ownedFolder(update.folderId(), userId).flatMap(target -> {
+                        message.setFolderId(target.getId());
+                        message.setSpam(target.isSystem() && "Spam".equals(target.getName()));
+                        return messageRepository.save(message);
+                    });
+                })
+                .flatMap(this::withAttachmentCount);
+    }
+
+    /** Into the Trash; a message already in the Trash is removed for good (with its attachment files). */
     public Mono<Void> deleteMessage(Long messageId, Long userId) {
-        return ownedMessage(messageId, userId).flatMap(messageRepository::delete);
+        return ownedMessage(messageId, userId)
+                .flatMap(message -> folderRepository.findById(message.getFolderId())
+                        .flatMap(folder -> {
+                            if (folder.isSystem() && "Trash".equals(folder.getName())) {
+                                return purge(message);
+                            }
+                            return systemFolder(userId, "Trash").flatMap(trash -> {
+                                message.setFolderId(trash.getId());
+                                return messageRepository.save(message).then();
+                            });
+                        }));
+    }
+
+    private Mono<Void> purge(Message message) {
+        return attachmentRepository.findByMessageId(message.getId())
+                .doOnNext(attachment -> deleteFile(attachment.getFilePath()))
+                .then(messageRepository.delete(message));
+    }
+
+    private static void deleteFile(String path) {
+        try {
+            Files.deleteIfExists(Paths.get(path));
+        } catch (IOException e) {
+            log.warn("Attachment file {} not deleted: {}", path, e.getMessage());
+        }
+    }
+
+    /** Bytes used by the mailbox: message texts plus attachments. */
+    public Mono<Long> usedBytes(Long userId) {
+        return Mono.zip(messageRepository.sumSizeByUserId(userId), attachmentRepository.sumSizeByUserId(userId))
+                .map(sizes -> sizes.getT1() + sizes.getT2());
     }
 
     /** The folder, when it belongs to the user; otherwise 404 — never someone else's mail. */
@@ -184,12 +396,40 @@ public class MailService {
                 .switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.NOT_FOUND, "Attachment not found")));
     }
 
+    private Mono<MessageResponse> withAttachmentCount(Message message) {
+        return attachmentRepository.countByMessageId(message.getId())
+                .defaultIfEmpty(0L)
+                .map(count -> {
+                    MessageResponse response = toResponse(message);
+                    response.setAttachmentCount(count.intValue());
+                    response.setHasAttachments(count > 0);
+                    return response;
+                });
+    }
+
+    private static MessageResponse preview(MessageResponse response) {
+        String body = response.getBody();
+        if (body == null) {
+            return response;
+        }
+        String text = response.isHtml() ? body.replaceAll("(?s)<style.*?</style>|<[^>]+>", " ") : body;
+        text = text.replace("&nbsp;", " ").replaceAll("\\s+", " ").trim();
+        response.setBody(text.length() > PREVIEW_CHARS ? text.substring(0, PREVIEW_CHARS) + "…" : text);
+        response.setHtml(false);
+        return response;
+    }
+
+    static ResponseStatusException badRequest(String reason) {
+        return new ResponseStatusException(HttpStatus.BAD_REQUEST, reason);
+    }
+
     private MessageResponse toResponse(Message message) {
         MessageResponse resp = new MessageResponse();
         resp.setId(message.getId());
         resp.setSenderEmail(message.getSenderEmail());
         resp.setSenderName(message.getSenderName());
         resp.setRecipientEmail(message.getRecipientEmail());
+        resp.setCcEmail(message.getCcEmail());
         resp.setSubject(message.getSubject());
         resp.setBody(message.getBody());
         resp.setHtml(message.isHtml());
@@ -202,10 +442,30 @@ public class MailService {
         return resp;
     }
 
+    /** Stores a file of an incoming message (blocking: called from the SMTP worker thread). */
+    public void storeIncomingAttachment(Long messageId, String filename, String contentType, byte[] bytes) throws IOException {
+        String safeName = com.mailserver.controller.MailController.safeFilename(filename);
+        Path path = Paths.get(attachmentsDir, UUID.randomUUID() + "_" + safeName);
+        Files.createDirectories(path.getParent());
+        Files.write(path, bytes);
+        Attachment attachment = new Attachment();
+        attachment.setMessageId(messageId);
+        attachment.setFilename(safeName);
+        attachment.setContentType(contentType);
+        attachment.setSizeBytes((long) bytes.length);
+        attachment.setFilePath(path.toString());
+        attachmentRepository.save(attachment).block();
+    }
+
+    /** Attachments of the user's draft, for building the message to send. */
+    public Flux<Attachment> draftAttachments(Long draftId, Long userId) {
+        return ownedDraft(draftId, userId).flatMapMany(draft -> attachmentRepository.findByMessageId(draft.getId()));
+    }
+
     public Mono<AttachmentResponse> saveAttachmentReactive(Long messageId, Long userId,
                                                      String originalFilename, String contentType,
                                                      long sizeBytes, String filePath) {
-        return ownedMessage(messageId, userId)
+        return ownedDraft(messageId, userId)
                 .flatMap(message -> {
                     Attachment attachment = new Attachment();
                     attachment.setMessageId(messageId);
@@ -213,7 +473,7 @@ public class MailService {
                     attachment.setContentType(contentType);
                     attachment.setSizeBytes(sizeBytes);
                     attachment.setFilePath(filePath);
-                    return attachmentRepository.save(attachment);
+                    return sources.remove(messageId).then(attachmentRepository.save(attachment));
                 })
                 .map(this::toAttachmentResponse);
     }
@@ -236,12 +496,8 @@ public class MailService {
     public Mono<Void> deleteAttachment(Long attachmentId, Long userId) {
         return ownedAttachment(attachmentId, userId)
                 .flatMap(attachment -> {
-                    try {
-                        Files.deleteIfExists(Paths.get(attachment.getFilePath()));
-                    } catch (IOException e) {
-                        log.warn("Attachment file {} not deleted: {}", attachment.getFilePath(), e.getMessage());
-                    }
-                    return attachmentRepository.delete(attachment);
+                    deleteFile(attachment.getFilePath());
+                    return sources.remove(attachment.getMessageId()).then(attachmentRepository.delete(attachment));
                 });
     }
 

backend/src/main/java/com/mailserver/service/MessageSources.java

@@ -0,0 +1,38 @@
+package com.mailserver.service;
+
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.stereotype.Component;
+import reactor.core.publisher.Mono;
+
+/**
+ * The message exactly as received or appended (table message_sources). IMAP serves it as BODY[]; a message without
+ * one gets its MIME text built once ({@link com.mailserver.imap.MimeSource}). A changed draft loses it.
+ */
+@Component
+public class MessageSources {
+
+    private final DatabaseClient db;
+
+    public MessageSources(DatabaseClient db) {
+        this.db = db;
+    }
+
+    public Mono<byte[]> get(Long messageId) {
+        return db.sql("SELECT raw FROM message_sources WHERE message_id = :id")
+                .bind("id", messageId)
+                .map(row -> row.get("raw", byte[].class))
+                .one();
+    }
+
+    public Mono<Void> put(Long messageId, byte[] raw) {
+        return db.sql("INSERT INTO message_sources (message_id, raw) VALUES (:id, :raw) "
+                        + "ON CONFLICT (message_id) DO UPDATE SET raw = EXCLUDED.raw")
+                .bind("id", messageId)
+                .bind("raw", raw)
+                .then();
+    }
+
+    public Mono<Void> remove(Long messageId) {
+        return db.sql("DELETE FROM message_sources WHERE message_id = :id").bind("id", messageId).then();
+    }
+}

backend/src/main/java/com/mailserver/service/SubmissionService.java

@@ -1,32 +1,51 @@
 package com.mailserver.service;
 
+import com.mailserver.domain.Attachment;
+import com.mailserver.domain.User;
 import com.mailserver.dto.MessageResponse;
 import com.mailserver.dto.SendRequest;
 import com.mailserver.repository.UserRepository;
 import com.mailserver.smtp.MailRouter;
 import com.mailserver.smtp.SmtpBackend;
 import jakarta.mail.Message;
+import jakarta.mail.MessagingException;
 import jakarta.mail.Session;
+import jakarta.mail.internet.AddressException;
 import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeBodyPart;
 import jakarta.mail.internet.MimeMessage;
+import jakarta.mail.internet.MimeMultipart;
+import jakarta.mail.internet.MimeUtility;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import org.springframework.web.server.ResponseStatusException;
+import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.core.scheduler.Schedulers;
 
 import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Properties;
+import java.util.Set;
 import java.util.UUID;
 
-/** "Send" in the web client: builds the MIME message and routes it like an authenticated SMTP submission. */
+/**
+ * "Send" in the web client: builds the MIME message (with the draft's attachments) and routes it like an
+ * authenticated SMTP submission — to every To and Cc address.
+ */
 @Service
 public class SubmissionService {
 
+    /** One message, at most this many addresses (To + Cc). */
+    static final int MAX_RECIPIENTS = 50;
+
     private final UserRepository users;
     private final MailService mailService;
     private final MailRouter router;
@@ -41,34 +60,109 @@ public class SubmissionService {
     }
 
     public Mono<MessageResponse> send(String fromEmail, SendRequest request) {
-        String to = request.getTo().trim().toLowerCase(Locale.ROOT);
+        List<String> to = addresses(request.getTo());
+        List<String> cc = addresses(request.getCc());
+        cc.removeAll(to);
+        if (to.isEmpty()) {
+            return Mono.error(MailService.badRequest("No recipient"));
+        }
+        if (to.size() + cc.size() > MAX_RECIPIENTS) {
+            return Mono.error(MailService.badRequest("At most " + MAX_RECIPIENTS + " recipients"));
+        }
+        Long draftId = request.getDraftId();
         return users.findByEmail(fromEmail)
                 .switchIfEmpty(Mono.error(new ResponseStatusException(HttpStatus.UNAUTHORIZED)))
-                .flatMap(user -> Mono.fromCallable(() -> {
-                    SmtpBackend.Route route = router.route(to, user.getEmail());
-                    switch (route) {
-                        case LOCAL, OUTBOUND -> { }
-                        case UNKNOWN_USER -> throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "No such mailbox: " + to);
-                        case OUTBOUND_DISABLED -> throw new ResponseStatusException(HttpStatus.BAD_REQUEST,
-                                "Sending outside is disabled on this server");
-                        case RELAY_DENIED -> throw new IllegalStateException("logged-in user denied relay");
-                    }
-                    String messageId = UUID.randomUUID() + "@" + hostname;
-                    MimeMessage mime = new MimeMessage(Session.getInstance(new Properties()));
-                    mime.setFrom(new InternetAddress(user.getEmail(), user.getDisplayName(), "UTF-8"));
-                    mime.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
-                    mime.setSubject(request.getSubject(), "UTF-8");
-                    mime.setText(request.getBody(), "UTF-8", request.isHtml() ? "html" : "plain");
-                    mime.setSentDate(new Date());
-                    mime.saveChanges();
-                    mime.setHeader("Message-ID", "<" + messageId + ">");
-                    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
-                    mime.writeTo(bytes);
-                    router.accept(new SmtpBackend.Envelope("127.0.0.1", hostname, user.getEmail(), user.getEmail(),
-                            List.of(new SmtpBackend.Recipient(to, route))), bytes.toByteArray());
-                    return messageId;
-                }).subscribeOn(Schedulers.boundedElastic())
-                        .flatMap(messageId -> mailService.saveSent(user, to, request.getSubject(), request.getBody(),
-                                request.isHtml(), messageId)));
+                .flatMap(user -> (draftId == null ? Flux.<Attachment>empty() : mailService.draftAttachments(draftId, user.getId()))
+                        .collectList()
+                        .flatMap(attachments -> Mono.fromCallable(() -> submit(user, to, cc, request, attachments))
+                                .subscribeOn(Schedulers.boundedElastic()))
+                        .flatMap(messageId -> mailService.saveSent(user, String.join(", ", to), String.join(", ", cc),
+                                request.getSubject(), request.getBody(), request.isHtml(), messageId))
+                        .flatMap(sent -> (draftId == null ? Mono.<Void>empty() : mailService.finishDraft(draftId, sent.getId()))
+                                .then(mailService.getMessage(sent.getId(), user.getId()))));
     }
+
+    private String submit(User user, List<String> to, List<String> cc, SendRequest request, List<Attachment> attachments)
+            throws Exception {
+        List<SmtpBackend.Recipient> recipients = new ArrayList<>();
+        for (String address : concat(to, cc)) {
+            SmtpBackend.Route route = router.route(address, user.getEmail());
+            switch (route) {
+                case LOCAL, OUTBOUND -> recipients.add(new SmtpBackend.Recipient(address, route));
+                case UNKNOWN_USER -> throw MailService.badRequest("No such mailbox: " + address);
+                case OUTBOUND_DISABLED -> throw MailService.badRequest("Sending outside is disabled on this server: " + address);
+                case RELAY_DENIED -> throw new IllegalStateException("logged-in user denied relay");
+            }
+        }
+        String messageId = UUID.randomUUID() + "@" + hostname;
+        MimeMessage mime = mime(user, to, cc, request, attachments);
+        mime.setHeader("Message-ID", "<" + messageId + ">");
+        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+        mime.writeTo(bytes);
+        router.accept(new SmtpBackend.Envelope("127.0.0.1", hostname, user.getEmail(), user.getEmail(), recipients),
+                bytes.toByteArray());
+        return messageId;
+    }
+
+    static MimeMessage mime(User user, List<String> to, List<String> cc, SendRequest request, List<Attachment> attachments)
+            throws MessagingException, IOException {
+        MimeMessage mime = new MimeMessage(Session.getInstance(new Properties()));
+        mime.setFrom(new InternetAddress(user.getEmail(), user.getDisplayName(), "UTF-8"));
+        mime.setRecipients(Message.RecipientType.TO, InternetAddress.parse(String.join(",", to)));
+        if (!cc.isEmpty()) {
+            mime.setRecipients(Message.RecipientType.CC, InternetAddress.parse(String.join(",", cc)));
+        }
+        mime.setSubject(request.getSubject(), "UTF-8");
+        String subtype = request.isHtml() ? "html" : "plain";
+        if (attachments.isEmpty()) {
+            mime.setText(request.getBody(), "UTF-8", subtype);
+        } else {
+            MimeMultipart mixed = new MimeMultipart("mixed");
+            MimeBodyPart text = new MimeBodyPart();
+            text.setText(request.getBody(), "UTF-8", subtype);
+            mixed.addBodyPart(text);
+            for (Attachment attachment : attachments) {
+                MimeBodyPart file = new MimeBodyPart();
+                file.attachFile(new File(attachment.getFilePath()),
+                        attachment.getContentType() == null ? "application/octet-stream" : attachment.getContentType(), null);
+                file.setFileName(MimeUtility.encodeText(attachment.getFilename(), "UTF-8", null));
+                mixed.addBodyPart(file);
+            }
+            mime.setContent(mixed);
+        }
+        mime.setSentDate(new Date());
+        mime.saveChanges();
+        return mime;
+    }
+
+    /** "a@x, b@y; c@z" → lower-case addresses without repeats; a malformed one → 400. */
+    static List<String> addresses(String raw) {
+        Set<String> result = new LinkedHashSet<>();
+        if (raw == null) {
+            return new ArrayList<>();
+        }
+        for (String part : raw.split("[,;\\s]+")) {
+            String address = part.trim().toLowerCase(Locale.ROOT);
+            if (address.isEmpty()) {
+                continue;
+            }
+            try {
+                new InternetAddress(address, true).validate();
+            } catch (AddressException e) {
+                throw MailService.badRequest("Invalid address: " + address);
+            }
+            if (!address.contains("@")) {
+                throw MailService.badRequest("Invalid address: " + address);
+            }
+            result.add(address);
+        }
+        return new ArrayList<>(result);
+    }
+
+    private static List<String> concat(List<String> a, List<String> b) {
+        List<String> all = new ArrayList<>(a);
+        all.addAll(b);
+        return all;
+    }
+
 }

backend/src/main/java/com/mailserver/service/UserService.java

@@ -2,7 +2,6 @@ package com.mailserver.service;
 
 import com.mailserver.domain.Folder;
 import com.mailserver.domain.User;
-import com.mailserver.dto.FolderResponse;
 import com.mailserver.repository.FolderRepository;
 import com.mailserver.repository.UserRepository;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
@@ -35,18 +34,18 @@ public class UserService {
                     User user = new User();
                     user.setEmail(email);
                     user.setPassword(passwordEncoder.encode(password));
-                    user.setDisplayName(displayName);
+                    user.setDisplayName(displayName == null || displayName.isBlank() ? email.substring(0, email.indexOf('@')) : displayName.trim());
                     user.setCreatedAt(Instant.now());
                     return userRepository.save(user);
                 })
                 .flatMap(user -> {
                     // Создаём стандартные папки
-                    String[] defaultFolders = {"INBOX", "Sent", "Drafts", "Trash", "Spam"};
-                    return Flux.fromArray(defaultFolders)
-                            .flatMap(name -> {
+                    return Flux.fromIterable(MailService.SYSTEM_FOLDERS)
+                            .concatMap(name -> {
                                 Folder folder = new Folder();
                                 folder.setUserId(user.getId());
                                 folder.setName(name);
+                                folder.setSystem(true);
                                 folder.setCreatedAt(Instant.now());
                                 return folderRepository.save(folder);
                             })
@@ -66,15 +65,36 @@ public class UserService {
         return passwordEncoder.matches(rawPassword, user.getPassword());
     }
 
-    public Flux<FolderResponse> getFolders(Long userId) {
-        return folderRepository.findByUserId(userId)
-                .map(f -> {
-                    FolderResponse resp = new FolderResponse();
-                    resp.setId(f.getId());
-                    resp.setName(f.getName());
-                    resp.setMessageCount(f.getMessageCount());
-                    resp.setUnreadCount(f.getUnreadCount());
-                    return resp;
-                });
+    /** New password, only with the current one. */
+    public Mono<Void> changePassword(User user, String currentPassword, String newPassword) {
+        if (!checkPassword(user, currentPassword)) {
+            return Mono.error(MailService.badRequest("Current password is wrong"));
+        }
+        user.setPassword(passwordEncoder.encode(newPassword));
+        return userRepository.save(user).then();
+    }
+
+    public Flux<User> all() {
+        return userRepository.findAll();
+    }
+
+    public Mono<User> byId(Long id) {
+        return userRepository.findById(id);
+    }
+
+    /** Administrator sets a new password (Settings → Mailboxes): no current password needed. */
+    public Mono<User> setPassword(User user, String newPassword) {
+        user.setPassword(passwordEncoder.encode(newPassword));
+        return userRepository.save(user);
+    }
+
+    public Mono<User> setActive(User user, boolean active) {
+        user.setActive(active);
+        return userRepository.save(user);
+    }
+
+    public Mono<User> updateDisplayName(User user, String displayName) {
+        user.setDisplayName(displayName.trim());
+        return userRepository.save(user);
     }
 }

backend/src/main/java/com/mailserver/smtp/MailRouter.java

@@ -14,8 +14,9 @@ import java.util.Locale;
 
 /**
  * Where mail goes — one rule for SMTP and for the web client:
- * our domain → our mailbox (or "no such user"); catch-all set → everything into that mailbox;
- * someone else's domain → the delivery queue, only for a logged-in sender (never an open relay).
+ * an existing mailbox of our domain → that mailbox; catch-all set → everything else into the catch-all mailbox
+ * (nothing goes outside, existing mailboxes still get their own mail); otherwise our domain without such a mailbox →
+ * "no such user", someone else's domain → the delivery queue, only for a logged-in sender (never an open relay).
  */
 @Service
 public class MailRouter implements SmtpBackend {
@@ -47,12 +48,14 @@ public class MailRouter implements SmtpBackend {
 
     @Override
     public Route route(String recipient, String authenticatedUser) {
+        if (domains.isLocal(recipient) && mailboxExists(recipient)) {
+            return Route.LOCAL;
+        }
         if (domains.catchAll() != null) {
             return Route.LOCAL;
         }
         if (domains.isLocal(recipient)) {
-            return Boolean.TRUE.equals(users.existsByEmail(recipient.toLowerCase(Locale.ROOT)).block())
-                    ? Route.LOCAL : Route.UNKNOWN_USER;
+            return Route.UNKNOWN_USER;
         }
         if (authenticatedUser == null) {
             return Route.RELAY_DENIED;
@@ -67,7 +70,7 @@ public class MailRouter implements SmtpBackend {
         for (Recipient recipient : envelope.recipients()) {
             switch (recipient.route()) {
                 case LOCAL -> {
-                    String mailbox = domains.catchAll() != null ? domains.catchAll() : recipient.address();
+                    String mailbox = mailbox(recipient.address());
                     localDelivery.deliver(message, mailbox, envelope.remoteIp(), envelope.mailFrom(), trusted);
                 }
                 case OUTBOUND -> {
@@ -80,4 +83,16 @@ public class MailRouter implements SmtpBackend {
             }
         }
     }
+
+    /** Mailbox that stores mail to this address: its own if it exists here, otherwise the catch-all one. */
+    String mailbox(String address) {
+        if (domains.catchAll() == null || (domains.isLocal(address) && mailboxExists(address))) {
+            return address;
+        }
+        return domains.catchAll();
+    }
+
+    private boolean mailboxExists(String address) {
+        return Boolean.TRUE.equals(users.existsByEmail(address.toLowerCase(Locale.ROOT)).block());
+    }
 }

backend/src/main/java/com/mailserver/smtp/ReloadingKeyManager.java

@@ -0,0 +1,194 @@
+package com.mailserver.smtp;
+
+import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
+import org.bouncycastle.openssl.PEMKeyPair;
+import org.bouncycastle.openssl.PEMParser;
+import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.net.ssl.SSLEngine;
+import javax.net.ssl.X509ExtendedKeyManager;
+import java.io.InputStream;
+import java.io.Reader;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileTime;
+import java.security.Principal;
+import java.security.PrivateKey;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.time.Clock;
+import java.time.Duration;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Server certificate and key from PEM files, read again when the files change — a Let's Encrypt certificate
+ * renewed on disk (lego, certbot) is picked up without a restart, for STARTTLS and implicit TLS alike: the JDK
+ * asks the key manager on every handshake. The files are checked at most once per {@code interval}; a file
+ * that cannot be read (a renewal half written) keeps the previous certificate and is tried again next time.
+ * <p>
+ * Key: PKCS#8 ({@code PRIVATE KEY}) or the traditional {@code RSA PRIVATE KEY} / {@code EC PRIVATE KEY} that
+ * lego and certbot write. Each loaded pair gets its own alias, so a handshake that asks for the chain and then
+ * for the key never mixes two generations.
+ */
+public final class ReloadingKeyManager extends X509ExtendedKeyManager {
+
+    private static final Logger log = LoggerFactory.getLogger(ReloadingKeyManager.class);
+    private static final String ALIAS_PREFIX = "mail-";
+
+    record Material(String alias, X509Certificate[] chain, PrivateKey key, FileTime certTime, FileTime keyTime) {
+    }
+
+    private final Path certFile;
+    private final Path keyFile;
+    private final Duration interval;
+    private final Clock clock;
+    /** The current pair and the one before it (a handshake may still hold its alias) */
+    private final Map<String, Material> byAlias = new ConcurrentHashMap<>();
+    private volatile Material current;
+    private volatile long checkedAt;
+    private int generation;
+
+    public ReloadingKeyManager(Path certFile, Path keyFile, Duration interval, Clock clock) throws Exception {
+        this.certFile = certFile;
+        this.keyFile = keyFile;
+        this.interval = interval;
+        this.clock = clock;
+        install(load());
+        this.checkedAt = clock.millis();
+    }
+
+    /** The pair to use now; reads the files again when the interval has passed and they changed */
+    Material material() {
+        long now = clock.millis();
+        if (now - checkedAt >= interval.toMillis()) {
+            synchronized (this) {
+                if (now - checkedAt >= interval.toMillis()) {
+                    checkedAt = now;
+                    reloadIfChanged();
+                }
+            }
+        }
+        return current;
+    }
+
+    private void reloadIfChanged() {
+        Material old = current;
+        try {
+            if (Files.getLastModifiedTime(certFile).equals(old.certTime())
+                    && Files.getLastModifiedTime(keyFile).equals(old.keyTime())) {
+                return;
+            }
+            Material fresh = load();
+            install(fresh);
+            log.info("TLS: certificate {} reloaded, valid until {}", certFile, fresh.chain()[0].getNotAfter());
+        } catch (Exception e) {
+            log.warn("TLS: cannot read {} / {} ({}), keeping the certificate valid until {}",
+                    certFile, keyFile, e.toString(), old.chain()[0].getNotAfter());
+        }
+    }
+
+    private synchronized void install(Material material) {
+        Material previous = current;
+        byAlias.keySet().removeIf(alias -> previous == null || !alias.equals(previous.alias()));
+        byAlias.put(material.alias(), material);
+        current = material;
+    }
+
+    private Material load() throws Exception {
+        FileTime certTime = Files.getLastModifiedTime(certFile);
+        FileTime keyTime = Files.getLastModifiedTime(keyFile);
+        X509Certificate[] chain;
+        try (InputStream in = Files.newInputStream(certFile)) {
+            chain = CertificateFactory.getInstance("X.509").generateCertificates(in).stream()
+                    .map(X509Certificate.class::cast).toArray(X509Certificate[]::new);
+        }
+        if (chain.length == 0) {
+            throw new IllegalStateException("no certificate in " + certFile);
+        }
+        PrivateKey key = readKey(keyFile);
+        if (!chain[0].getPublicKey().getAlgorithm().equals(key.getAlgorithm())) {
+            throw new IllegalStateException("the key in " + keyFile + " is " + key.getAlgorithm()
+                    + ", the certificate is " + chain[0].getPublicKey().getAlgorithm());
+        }
+        String alias;
+        synchronized (this) {
+            alias = ALIAS_PREFIX + (++generation);
+        }
+        return new Material(alias, chain, key, certTime, keyTime);
+    }
+
+    static PrivateKey readKey(Path file) throws Exception {
+        try (Reader reader = Files.newBufferedReader(file, StandardCharsets.US_ASCII);
+             PEMParser parser = new PEMParser(reader)) {
+            Object object;
+            while ((object = parser.readObject()) != null) {
+                JcaPEMKeyConverter converter = new JcaPEMKeyConverter();
+                if (object instanceof PrivateKeyInfo info) {
+                    return converter.getPrivateKey(info);
+                }
+                if (object instanceof PEMKeyPair pair) {
+                    return converter.getPrivateKey(pair.getPrivateKeyInfo()); // SEC1 may come without the public part
+                }
+                // EC PARAMETERS before EC PRIVATE KEY (openssl ecparam -genkey) — skip
+            }
+        }
+        throw new IllegalStateException("no private key in " + file);
+    }
+
+    private String serverAlias(String keyType) {
+        Material material = material();
+        String algorithm = material.key().getAlgorithm();
+        boolean fits = keyType == null || keyType.equalsIgnoreCase(algorithm)
+                || ("RSA".equals(algorithm) && keyType.equalsIgnoreCase("RSASSA-PSS"))
+                || ("EC".equals(algorithm) && keyType.toUpperCase().startsWith("EC"));
+        return fits ? material.alias() : null;
+    }
+
+    @Override
+    public String chooseServerAlias(String keyType, Principal[] issuers, Socket socket) {
+        return serverAlias(keyType);
+    }
+
+    @Override
+    public String chooseEngineServerAlias(String keyType, Principal[] issuers, SSLEngine engine) {
+        return serverAlias(keyType);
+    }
+
+    @Override
+    public String[] getServerAliases(String keyType, Principal[] issuers) {
+        String alias = serverAlias(keyType);
+        return alias == null ? null : new String[]{alias};
+    }
+
+    @Override
+    public X509Certificate[] getCertificateChain(String alias) {
+        Material material = alias == null ? null : byAlias.get(alias);
+        return material == null ? null : material.chain().clone();
+    }
+
+    @Override
+    public PrivateKey getPrivateKey(String alias) {
+        Material material = alias == null ? null : byAlias.get(alias);
+        return material == null ? null : material.key();
+    }
+
+    @Override
+    public String[] getClientAliases(String keyType, Principal[] issuers) {
+        return null;
+    }
+
+    @Override
+    public String chooseClientAlias(String[] keyType, Principal[] issuers, Socket socket) {
+        return null;
+    }
+
+    @Override
+    public String chooseEngineClientAlias(String[] keyType, Principal[] issuers, SSLEngine engine) {
+        return null;
+    }
+}

backend/src/main/java/com/mailserver/smtp/SmtpServer.java

@@ -1,13 +1,23 @@
 package com.mailserver.smtp;
 
+import com.mailserver.security.LoginGuard;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufUtil;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelPipeline;
 import io.netty.handler.codec.LineBasedFrameDecoder;
+import io.netty.handler.codec.MessageToMessageDecoder;
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslHandler;
 import io.netty.handler.timeout.ReadTimeoutHandler;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.core.scheduler.Schedulers;
+import reactor.netty.Connection;
 import reactor.netty.DisposableServer;
+import reactor.netty.NettyOutbound;
 import reactor.netty.tcp.TcpServer;
 
 import java.io.ByteArrayOutputStream;
@@ -32,7 +42,10 @@ import java.util.concurrent.TimeUnit;
  *   <li>the message is stored or queued before the client gets 250 — on failure 451 and the client retries;</li>
  *   <li>database and DNS work runs on a worker thread, not on the event loop.</li>
  * </ul>
- * No STARTTLS yet: AUTH is offered only when {@code authWithoutTls} is on (a closed network: inside a VM or a docker network).
+ * TLS (RFC 3207 STARTTLS, or implicit TLS on a separate port, RFC 8314): with a {@code tls} context STARTTLS is
+ * offered; AUTH only over TLS, or without it when {@code authWithoutTls} is on (a closed network: VM, docker network).
+ * After STARTTLS the session starts over (new EHLO), and lines sent in plain text together with STARTTLS are not
+ * executed — the connection is closed (command injection, CVE-2011-0411).
  */
 public class SmtpServer {
 
@@ -42,47 +55,116 @@ public class SmtpServer {
     static final int MAX_LINE = 64 * 1024;
     static final int MAX_RECIPIENTS = 100;
     private static final int MAX_BAD_COMMANDS = 20;
+    /** Wrong passwords in one connection before it is closed. */
+    private static final int MAX_AUTH_FAILURES = 3;
+    // Compared by identity: TLS starts right after exactly this reply is written
+    private static final String STARTTLS_READY = new String("220 2.0.0 Ready to start TLS\r\n");
 
+    /**
+     * @param tls         certificate for STARTTLS / implicit TLS; null — no TLS
+     * @param implicitTls TLS from the first byte (port 465), no STARTTLS
+     */
     public record Settings(String host, int port, String hostname, long maxMessageBytes, boolean authWithoutTls,
-                           Duration idleTimeout) {
+                           Duration idleTimeout, SslContext tls, boolean implicitTls) {
+
+        public Settings(String host, int port, String hostname, long maxMessageBytes, boolean authWithoutTls,
+                        Duration idleTimeout) {
+            this(host, port, hostname, maxMessageBytes, authWithoutTls, idleTimeout, null, false);
+        }
+    }
+
+    /** A line of input and whether it came over TLS. */
+    record Line(byte[] bytes, boolean tls) {
+    }
+
+    /** Marks each line: decoded behind an SslHandler (encrypted) or not. */
+    private static final class LineTagger extends MessageToMessageDecoder<ByteBuf> {
+        @Override
+        protected void decode(ChannelHandlerContext ctx, ByteBuf frame, List<Object> out) {
+            out.add(new Line(ByteBufUtil.getBytes(frame), ctx.pipeline().get(SslHandler.class) != null));
+        }
     }
 
     private final Settings settings;
     private final SmtpBackend backend;
+    private final LoginGuard guard;
     private DisposableServer server;
 
     public SmtpServer(Settings settings, SmtpBackend backend) {
+        this(settings, backend, LoginGuard.disabled());
+    }
+
+    public SmtpServer(Settings settings, SmtpBackend backend, LoginGuard guard) {
         this.settings = settings;
         this.backend = backend;
+        this.guard = guard;
     }
 
     public void start() {
-        server = TcpServer.create()
+        if (settings.implicitTls() && settings.tls() == null) {
+            throw new IllegalStateException("Implicit TLS needs a certificate");
+        }
+        TcpServer tcp = TcpServer.create()
                 .host(settings.host())
                 .port(settings.port())
                 .doOnConnection(connection -> connection
                         .addHandlerFirst("smtp-idle", new ReadTimeoutHandler(settings.idleTimeout().toSeconds(), TimeUnit.SECONDS))
-                        .addHandlerLast("smtp-lines", new LineBasedFrameDecoder(MAX_LINE, true, false)))
+                        .addHandlerLast("smtp-lines", new LineBasedFrameDecoder(MAX_LINE, true, false))
+                        .addHandlerLast("smtp-tag", new LineTagger()));
+        if (settings.implicitTls()) {
+            tcp = tcp.secure(spec -> spec.sslContext(settings.tls()));
+        }
+        server = tcp
                 .handle((inbound, outbound) -> {
+                    Connection[] connection = {null};
                     String[] remoteIp = {"unknown"};
                     inbound.withConnection(c -> {
+                        connection[0] = c;
                         if (c.address() instanceof InetSocketAddress address && address.getAddress() != null) {
                             remoteIp[0] = address.getAddress().getHostAddress();
                         }
                     });
-                    Session session = new Session(remoteIp[0]);
-                    Flux<String> replies = inbound.receive().asByteArray()
+                    Session session = new Session(remoteIp[0], settings.implicitTls());
+                    Flux<String> replies = inbound.receiveObject().cast(Line.class)
                             .concatMap(session::onLine)
                             .onErrorResume(e -> {
                                 log.debug("SMTP {}: connection closed: {}", session.remoteIp, e.toString());
                                 return Mono.just("421 4.4.2 " + settings.hostname() + " closing connection\r\n");
                             })
                             .takeUntil(reply -> session.closing);
-                    return outbound.sendString(Flux.concat(
-                            Mono.just("220 " + settings.hostname() + " ESMTP ready\r\n"), replies), StandardCharsets.US_ASCII);
+                    // One reply at a time, each written before the next line is handled: after "220 Ready to start TLS"
+                    // the TLS handler goes in only when the reply has left in plain text
+                    return Flux.concat(Mono.just("220 " + settings.hostname() + " ESMTP ready\r\n"), replies)
+                            .concatMap(reply -> send(outbound, reply)
+                                    .then(Mono.defer(() -> reply == STARTTLS_READY ? startTls(connection[0], session) : Mono.<Void>empty())))
+                            .then();
                 })
                 .bindNow(Duration.ofSeconds(10));
-        log.info("SMTP server listening on {}:{} ({})", settings.host(), port(), settings.hostname());
+        log.info("SMTP server listening on {}:{} ({}{})", settings.host(), port(), settings.hostname(),
+                settings.implicitTls() ? ", implicit TLS" : settings.tls() != null ? ", STARTTLS" : ", no TLS");
+    }
+
+    private static Mono<Void> send(NettyOutbound outbound, String reply) {
+        return outbound.sendString(Mono.just(reply), StandardCharsets.US_ASCII).then();
+    }
+
+    /** TLS handler in front, fresh line decoder (no plain-text leftovers mixed into encrypted input). */
+    private Mono<Void> startTls(Connection connection, Session session) {
+        ChannelPipeline pipeline = connection.channel().pipeline();
+        SslHandler ssl = settings.tls().newHandler(connection.channel().alloc());
+        pipeline.replace("smtp-lines", "smtp-lines", new LineBasedFrameDecoder(MAX_LINE, true, false));
+        pipeline.addFirst("smtp-tls", ssl);
+        return Mono.create(sink -> ssl.handshakeFuture().addListener(future -> {
+            if (future.isSuccess()) {
+                log.debug("SMTP {}: TLS {}", session.remoteIp, ssl.engine().getSession().getProtocol());
+                sink.success();
+            } else {
+                log.info("SMTP {}: TLS handshake failed: {}", session.remoteIp, future.cause().toString());
+                session.closing = true;
+                connection.dispose();
+                sink.success();
+            }
+        }));
     }
 
     public int port() {
@@ -99,6 +181,7 @@ public class SmtpServer {
 
     private final class Session {
         final String remoteIp;
+        boolean tls;
         State state = State.COMMAND;
         String helo;
         boolean extended;
@@ -109,14 +192,20 @@ public class SmtpServer {
         final ByteArrayOutputStream data = new ByteArrayOutputStream();
         boolean dataTooBig;
         int badCommands;
+        int authFailures;
         volatile boolean closing;
 
-        Session(String remoteIp) {
+        Session(String remoteIp, boolean tls) {
             this.remoteIp = remoteIp;
+            this.tls = tls;
         }
 
-        Mono<String> onLine(byte[] raw) {
-            byte[] line = stripCr(raw);
+        Mono<String> onLine(Line input) {
+            if (tls && !input.tls()) {
+                // Sent in plain text after STARTTLS, before the handshake: never execute it
+                return Mono.error(new IllegalStateException("plain-text input after STARTTLS"));
+            }
+            byte[] line = stripCr(input.bytes());
             return switch (state) {
                 case DATA -> onDataLine(line);
                 case AUTH_PLAIN -> authPlain(ascii(line));
@@ -142,7 +231,7 @@ public class SmtpServer {
                 }
                 case "NOOP" -> reply("250 2.0.0 OK");
                 case "VRFY" -> reply("252 2.5.0 Cannot VRFY user, but will accept message");
-                case "STARTTLS" -> reply("454 4.7.0 TLS not available");
+                case "STARTTLS" -> startTls(arg);
                 case "QUIT" -> {
                     closing = true;
                     yield reply("221 2.0.0 " + settings.hostname() + " Bye");
@@ -167,15 +256,41 @@ public class SmtpServer {
             sb.append("250-SIZE ").append(settings.maxMessageBytes()).append("\r\n");
             sb.append("250-8BITMIME\r\n");
             sb.append("250-PIPELINING\r\n");
-            if (settings.authWithoutTls()) {
+            if (settings.tls() != null && !tls) {
+                sb.append("250-STARTTLS\r\n");
+            }
+            if (authAllowed()) {
                 sb.append("250-AUTH PLAIN LOGIN\r\n");
             }
             sb.append("250 ENHANCEDSTATUSCODES\r\n");
             return Mono.just(sb.toString());
         }
 
+        private boolean authAllowed() {
+            return tls || settings.authWithoutTls();
+        }
+
+        private Mono<String> startTls(String arg) {
+            if (settings.tls() == null) {
+                return reply("454 4.7.0 TLS not available");
+            }
+            if (tls) {
+                return bad("503 5.5.1 TLS already active");
+            }
+            if (!arg.isEmpty()) {
+                return reply("501 5.5.4 Syntax: STARTTLS");
+            }
+            // RFC 3207 4.2: everything known about the client is forgotten, a new EHLO is expected
+            tls = true;
+            helo = null;
+            extended = false;
+            authenticatedUser = null;
+            resetTransaction();
+            return Mono.just(STARTTLS_READY);
+        }
+
         private Mono<String> auth(String arg) {
-            if (!settings.authWithoutTls()) {
+            if (!authAllowed()) {
                 return reply("538 5.7.11 Encryption required for requested authentication mechanism");
             }
             if (helo == null || !extended) {
@@ -251,16 +366,32 @@ public class SmtpServer {
 
         private Mono<String> checkPassword(String user, String password) {
             String username = user.trim().toLowerCase(Locale.ROOT);
+            Duration wait = guard.retryAfter(remoteIp, username);
+            if (!wait.isZero()) {
+                // Blocked: the password is not even checked, the connection is closed
+                log.warn("SMTP {}: login as {} refused, blocked for {}", remoteIp, username, LoginGuard.human(wait));
+                closing = true;
+                return reply("421 4.7.0 Too many failed logins, try again in " + LoginGuard.human(wait));
+            }
             return blocking(() -> backend.authenticate(username, password))
-                    .map(ok -> {
+                    .flatMap(ok -> {
                         if (ok) {
+                            guard.success(remoteIp, username);
                             authenticatedUser = username;
                             log.info("SMTP {}: authenticated as {}", remoteIp, username);
-                            return "235 2.7.0 Authentication successful\r\n";
+                            return Mono.just("235 2.7.0 Authentication successful\r\n");
                         }
+                        guard.failure(remoteIp, username);
                         log.warn("SMTP {}: authentication failed for {}", remoteIp, username);
                         badCommands++;
-                        return "535 5.7.8 Authentication credentials invalid\r\n";
+                        if (++authFailures >= MAX_AUTH_FAILURES) {
+                            closing = true;
+                        }
+                        String answer = closing
+                                ? "535 5.7.8 Authentication credentials invalid, closing connection\r\n"
+                                : "535 5.7.8 Authentication credentials invalid\r\n";
+                        Duration delay = guard.failureDelay();
+                        return delay.isZero() ? Mono.just(answer) : Mono.just(answer).delayElement(delay);
                     });
         }
 
@@ -369,7 +500,7 @@ public class SmtpServer {
 
         private byte[] withReceivedHeader(byte[] message) {
             String received = "Received: from " + helo + " ([" + remoteIp + "])\r\n"
-                    + "\tby " + settings.hostname() + " with " + (authenticatedUser != null ? "ESMTPA" : "ESMTP") + ";\r\n"
+                    + "\tby " + settings.hostname() + " with " + (tls ? "ESMTPS" : "ESMTP") + (authenticatedUser != null ? "A" : "") + ";\r\n"
                     + "\t" + DateTimeFormatter.RFC_1123_DATE_TIME.format(ZonedDateTime.now()) + "\r\n";
             byte[] header = received.getBytes(StandardCharsets.US_ASCII);
             byte[] all = new byte[header.length + message.length];

backend/src/main/java/com/mailserver/smtp/SmtpTls.java

@@ -0,0 +1,114 @@
+package com.mailserver.smtp;
+
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslContextBuilder;
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.Extension;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.bouncycastle.asn1.x509.GeneralNames;
+import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
+import org.bouncycastle.cert.jcajce.JcaX509v3CertificateBuilder;
+import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.SecureRandom;
+import java.security.cert.X509Certificate;
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Base64;
+import java.util.Date;
+
+/**
+ * Certificate for SMTP TLS (STARTTLS and implicit TLS):
+ * <ul>
+ *   <li>{@code cert} and {@code key} given (PEM: certificate chain and the key — PKCS#8, RSA or EC, e.g. from Let's Encrypt) —
+ *       used as is and read again when the files change ({@link ReloadingKeyManager}, checked once a minute);</li>
+ *   <li>otherwise a self-signed certificate for the server hostname, created once in {@code dir} and reused —
+ *       enough for encryption between our own services; other servers deliver over it too (MX delivery does not
+ *       check certificates, RFC 7435 opportunistic TLS).</li>
+ * </ul>
+ */
+public final class SmtpTls {
+
+    private static final Logger log = LoggerFactory.getLogger(SmtpTls.class);
+    static final String CERT_FILE = "smtp-cert.pem";
+    static final String KEY_FILE = "smtp-key.pem";
+    static final Duration RELOAD_CHECK = Duration.ofMinutes(1);
+
+    private SmtpTls() {
+    }
+
+    public static SslContext serverContext(String certFile, String keyFile, Path dir, String hostname) throws Exception {
+        boolean givenCert = certFile != null && !certFile.isBlank();
+        boolean givenKey = keyFile != null && !keyFile.isBlank();
+        if (givenCert != givenKey) {
+            throw new IllegalStateException("TLS: set both the certificate and the key file, or neither");
+        }
+        Path cert;
+        Path key;
+        if (givenCert) {
+            cert = Path.of(certFile);
+            key = Path.of(keyFile);
+            log.info("SMTP TLS: certificate {}", cert);
+        } else {
+            cert = dir.resolve(CERT_FILE);
+            key = dir.resolve(KEY_FILE);
+            if (!Files.exists(cert) || !Files.exists(key)) {
+                selfSigned(hostname, cert, key);
+                log.warn("SMTP TLS: created a self-signed certificate for {} in {}", hostname, dir);
+            } else {
+                log.info("SMTP TLS: self-signed certificate {}", cert);
+            }
+        }
+        // Read again when the files change (a renewed Let's Encrypt certificate) — no restart needed
+        return SslContextBuilder.forServer(new ReloadingKeyManager(cert, key, RELOAD_CHECK, Clock.systemUTC()))
+                .protocols("TLSv1.3", "TLSv1.2")
+                .build();
+    }
+
+    static void selfSigned(String hostname, Path certFile, Path keyFile) throws Exception {
+        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
+        generator.initialize(2048, new SecureRandom());
+        KeyPair pair = generator.generateKeyPair();
+        X500Name name = new X500Name("CN=" + hostname);
+        Instant now = Instant.now();
+        JcaX509v3CertificateBuilder builder = new JcaX509v3CertificateBuilder(name,
+                new BigInteger(64, new SecureRandom()), Date.from(now.minus(Duration.ofDays(1))),
+                Date.from(now.plus(Duration.ofDays(3650))), name, pair.getPublic());
+        builder.addExtension(Extension.subjectAlternativeName, false,
+                new GeneralNames(new GeneralName(GeneralName.dNSName, hostname)));
+        X509Certificate certificate = new JcaX509CertificateConverter()
+                .getCertificate(builder.build(new JcaContentSignerBuilder("SHA256withRSA").build(pair.getPrivate())));
+
+        Files.createDirectories(keyFile.toAbsolutePath().getParent());
+        write(keyFile, pem("PRIVATE KEY", pair.getPrivate().getEncoded()), true);
+        write(certFile, pem("CERTIFICATE", certificate.getEncoded()), false);
+    }
+
+    private static String pem(String type, byte[] der) {
+        return "-----BEGIN " + type + "-----\n"
+                + Base64.getMimeEncoder(64, new byte[]{'\n'}).encodeToString(der)
+                + "\n-----END " + type + "-----\n";
+    }
+
+    private static void write(Path file, String text, boolean secret) throws IOException {
+        Files.writeString(file, text, StandardCharsets.US_ASCII);
+        if (secret) {
+            try {
+                Files.setPosixFilePermissions(file, PosixFilePermissions.fromString("rw-------"));
+            } catch (UnsupportedOperationException ignored) {
+                // not a POSIX file system
+            }
+        }
+    }
+}

backend/src/main/resources/application.properties

@@ -21,12 +21,16 @@ spring.flyway.baseline-on-migrate=true
 
 jwt.secret=${JWT_SECRET}
 
-# Mailboxes of these domains live here; catch-all: every message to any address goes into this one mailbox (mail trap)
+# Mailboxes of these domains live here; catch-all: mail to any address without its own mailbox here goes into this one mailbox (mail trap), nothing goes outside
 mailserver.domains=${MAIL_DOMAINS:localhost}
 mailserver.catch-all=${MAIL_CATCH_ALL:}
 mailserver.registration.enabled=${MAIL_REGISTRATION:false}
 mailserver.admin.email=${MAIL_ADMIN_EMAIL:}
 mailserver.admin.password=${MAIL_ADMIN_PASSWORD:}
+# Who manages mailboxes (Settings → Mailboxes), comma separated; empty — the first mailbox (admin.email or admin@<first domain>)
+mailserver.admins=${MAIL_ADMINS:}
+# Generated passwords of created mailboxes (first admin, catch-all) are appended here (mode 600); empty — printed to the log once
+mailserver.passwords-file=${MAIL_PASSWORDS_FILE:}
 mailserver.cors.origins=${MAIL_CORS_ORIGINS:}
 
 # Attachments
@@ -39,6 +43,15 @@ mailserver.smtp.port=${SMTP_PORT:3025}
 mailserver.smtp.hostname=${MAIL_HOSTNAME:localhost}
 mailserver.smtp.auth-without-tls=${SMTP_AUTH_WITHOUT_TLS:false}
 mailserver.smtp.max-message-bytes=26214400
+# TLS (75.1): STARTTLS on the SMTP port; implicit TLS on SMTPS_PORT (465) if set. Certificate: MAIL_TLS_CERT + MAIL_TLS_KEY
+# (PEM, PKCS#8 key), otherwise a self-signed one created once in MAIL_TLS_DIR. MAIL_TLS=false — no TLS
+mailserver.tls.enabled=${MAIL_TLS:true}
+mailserver.tls.cert-file=${MAIL_TLS_CERT:}
+mailserver.tls.key-file=${MAIL_TLS_KEY:}
+mailserver.tls.dir=${MAIL_TLS_DIR:./tls}
+# Web client + API over HTTPS with the same certificate (public compose: 8443 → 443); 0 — only plain HTTP (server.port)
+mailserver.https.port=${HTTPS_PORT:0}
+mailserver.smtps.port=${SMTPS_PORT:0}
 
 # Outbound: off | mx (straight to recipients' MX, port 25) | smarthost (via a provider, e.g. Resend)
 mailserver.outbound.mode=${OUTBOUND_MODE:off}
@@ -48,10 +61,12 @@ mailserver.outbound.username=${OUTBOUND_USERNAME:}
 mailserver.outbound.password=${OUTBOUND_PASSWORD:}
 mailserver.outbound.tls=${OUTBOUND_TLS:starttls}
 
-# IMAP — off: simplified, blocks the event loop (v0.2.3 75.2)
-mailserver.imap.enabled=false
-mailserver.imap.port=1143
-mailserver.imap.hostname=localhost
+# IMAP (75.2): STARTTLS on IMAP_PORT, implicit TLS on IMAPS_PORT (993) if set; same certificate as SMTP.
+# LOGIN only inside TLS unless IMAP_AUTH_WITHOUT_TLS=true (a closed network only)
+mailserver.imap.enabled=${IMAP_ENABLED:true}
+mailserver.imap.port=${IMAP_PORT:3143}
+mailserver.imaps.port=${IMAPS_PORT:0}
+mailserver.imap.auth-without-tls=${IMAP_AUTH_WITHOUT_TLS:false}
 
 # DKIM — signing of our mail; DNS record printed to the log at start
 mailserver.dkim.enabled=${DKIM_ENABLED:true}
@@ -72,3 +87,15 @@ management.endpoints.web.exposure.include=health
 management.endpoint.health.show-details=never
 
 logging.level.com.mailserver=INFO
+
+# Brute-force protection for SMTP AUTH, IMAP login, web login and password change (one counter for all of them):
+# MAX_PER_IP wrong passwords from one IP within WINDOW → the IP is blocked for BLOCK (each next block twice as long,
+# up to MAX_BLOCK); MAX_PER_ACCOUNT wrong passwords to one mailbox from any IPs → the mailbox is blocked for BLOCK,
+# except for IPs that logged in to it before. TRUSTED_IPS (comma-separated) are never blocked by IP
+mailserver.login-guard.enabled=${LOGIN_GUARD:true}
+mailserver.login-guard.max-per-ip=${LOGIN_GUARD_MAX_PER_IP:10}
+mailserver.login-guard.max-per-account=${LOGIN_GUARD_MAX_PER_ACCOUNT:20}
+mailserver.login-guard.window=${LOGIN_GUARD_WINDOW:15m}
+mailserver.login-guard.block=${LOGIN_GUARD_BLOCK:15m}
+mailserver.login-guard.max-block=${LOGIN_GUARD_MAX_BLOCK:24h}
+mailserver.login-guard.trusted-ips=${LOGIN_GUARD_TRUSTED_IPS:}

backend/src/main/resources/db/migration/V3__mail_cabinet.sql

@@ -0,0 +1,10 @@
+-- Mail cabinet: several recipients and copy, system vs own folders
+ALTER TABLE messages ALTER COLUMN recipient_email TYPE TEXT;
+ALTER TABLE messages ADD COLUMN cc_email TEXT;
+
+ALTER TABLE folders ADD COLUMN is_system BOOLEAN NOT NULL DEFAULT FALSE;
+UPDATE folders SET is_system = TRUE WHERE name IN ('INBOX', 'Sent', 'Drafts', 'Trash', 'Spam');
+CREATE UNIQUE INDEX idx_folders_user_name ON folders(user_id, LOWER(name));
+
+-- the attachments entity always had content_id (inline images, cid:) — the column was missing
+ALTER TABLE attachments ADD COLUMN content_id VARCHAR(255);

backend/src/main/resources/db/migration/V4__imap.sql

@@ -0,0 +1,43 @@
+-- IMAP (75.2): UIDs per folder, IMAP flags, the original message text
+
+-- UIDVALIDITY: never changes for a folder; UIDNEXT: the next UID to give out
+ALTER TABLE folders ADD COLUMN uid_validity BIGINT NOT NULL DEFAULT (EXTRACT(EPOCH FROM now())::BIGINT);
+ALTER TABLE folders ADD COLUMN uid_next BIGINT NOT NULL DEFAULT 1;
+
+-- UID inside the folder; strictly increasing — a message moved into a folder gets a new, larger UID
+ALTER TABLE messages ADD COLUMN uid BIGINT;
+ALTER TABLE messages ADD COLUMN is_answered BOOLEAN NOT NULL DEFAULT FALSE;
+ALTER TABLE messages ADD COLUMN is_deleted BOOLEAN NOT NULL DEFAULT FALSE;
+
+UPDATE messages m SET uid = numbered.n
+FROM (SELECT id, ROW_NUMBER() OVER (PARTITION BY folder_id ORDER BY received_at, id) AS n FROM messages) numbered
+WHERE m.id = numbered.id;
+
+UPDATE folders f SET uid_next = COALESCE((SELECT MAX(uid) FROM messages WHERE folder_id = f.id), 0) + 1;
+
+ALTER TABLE messages ALTER COLUMN uid SET NOT NULL;
+CREATE UNIQUE INDEX idx_messages_folder_uid ON messages(folder_id, uid);
+
+-- The UID is given out by the database, so every path that stores or moves a message (SMTP, web client, IMAP)
+-- gets it right without knowing about IMAP
+CREATE FUNCTION assign_message_uid() RETURNS trigger AS $$
+BEGIN
+    UPDATE folders SET uid_next = uid_next + 1 WHERE id = NEW.folder_id RETURNING uid_next - 1 INTO NEW.uid;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER messages_uid_on_insert BEFORE INSERT ON messages
+    FOR EACH ROW EXECUTE FUNCTION assign_message_uid();
+
+-- The web client saves the whole row (folder_id included) — only a real move gets a new UID
+CREATE TRIGGER messages_uid_on_move BEFORE UPDATE OF folder_id ON messages
+    FOR EACH ROW WHEN (NEW.folder_id IS DISTINCT FROM OLD.folder_id) EXECUTE FUNCTION assign_message_uid();
+
+-- The message exactly as received (SMTP) or appended (IMAP APPEND); for messages without it the server builds
+-- the MIME text once from the stored fields and keeps it here, so sizes and bytes never change between fetches.
+-- Removed when a draft changes.
+CREATE TABLE message_sources (
+    message_id BIGINT PRIMARY KEY REFERENCES messages(id) ON DELETE CASCADE,
+    raw BYTEA NOT NULL
+);

backend/src/test/java/com/mailserver/config/DataInitializerTest.java

@@ -0,0 +1,26 @@
+package com.mailserver.config;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.PosixFilePermissions;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class DataInitializerTest {
+
+    @Test
+    void generatedPasswordsAreAppendedToAFileOnlyTheOwnerReads(@TempDir Path dir) throws Exception {
+        Path file = dir.resolve("data/initial-passwords.txt");
+
+        DataInitializer.appendPassword(file, "admin@mail.test", "secret-1");
+        DataInitializer.appendPassword(file, "trap@mail.test", "secret-2");
+
+        assertThat(Files.readAllLines(file)).hasSize(2);
+        assertThat(Files.readAllLines(file).get(0)).endsWith(" admin@mail.test secret-1");
+        assertThat(Files.readAllLines(file).get(1)).endsWith(" trap@mail.test secret-2");
+        assertThat(PosixFilePermissions.toString(Files.getPosixFilePermissions(file))).isEqualTo("rw-------");
+    }
+}

backend/src/test/java/com/mailserver/config/HttpsConfigTest.java

@@ -0,0 +1,45 @@
+package com.mailserver.config;
+
+import com.mailserver.smtp.SmtpTls;
+import io.netty.handler.ssl.SslContextBuilder;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.server.reactive.HttpHandler;
+import reactor.core.publisher.Mono;
+import reactor.netty.http.client.HttpClient;
+
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** https://mail.jambocheck.com: the web client over HTTPS with the mail certificate. */
+class HttpsConfigTest {
+
+    @Test
+    void servesTheWebAppOverTls(@TempDir Path dir) throws Exception {
+        MailServerConfig.SmtpTlsContext tls = new MailServerConfig.SmtpTlsContext(SmtpTls.serverContext("", "", dir, "localhost"));
+        HttpHandler handler = (request, response) -> {
+            response.setStatusCode(HttpStatus.OK);
+            return response.writeWith(Mono.just(DefaultDataBufferFactory.sharedInstance
+                    .wrap(("hello " + request.getURI().getScheme()).getBytes(StandardCharsets.UTF_8))));
+        };
+        io.netty.handler.ssl.SslContext trustAll = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
+        HttpsConfig.HttpsServer server = new HttpsConfig.HttpsServer(handler, tls, "127.0.0.1", 0);
+        server.start();
+        try {
+            assertThat(server.isRunning()).isTrue();
+            String body = HttpClient.create()
+                    .secure(spec -> spec.sslContext(trustAll))
+                    .get().uri("https://127.0.0.1:" + server.port() + "/")
+                    .responseContent().aggregate().asString().block();
+            assertThat(body).isEqualTo("hello https");
+        } finally {
+            server.stop();
+        }
+        assertThat(server.isRunning()).isFalse();
+    }
+}

backend/src/test/java/com/mailserver/config/LoginGuardConfigTest.java

@@ -0,0 +1,46 @@
+package com.mailserver.config;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
+
+import java.net.InetSocketAddress;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class LoginGuardConfigTest {
+
+    private final LoginGuardConfig.TrustedProxyHeaderTransformer transformer = new LoginGuardConfig.TrustedProxyHeaderTransformer();
+
+    private ServerHttpRequest from(String peer) {
+        return MockServerHttpRequest.post("/api/login")
+                .remoteAddress(new InetSocketAddress(peer, 40000))
+                .header("X-Forwarded-For", "198.51.100.9")
+                .header("X-Forwarded-Proto", "https")
+                .build();
+    }
+
+    @Test
+    void forwardedForIsBelievedFromAPrivateProxy() {
+        ServerHttpRequest request = transformer.apply(from("172.18.0.5"));
+        assertThat(request.getRemoteAddress().getHostString()).isEqualTo("198.51.100.9");
+        assertThat(request.getURI().getScheme()).isEqualTo("https");
+    }
+
+    @Test
+    void forwardedForFromTheInternetIsDropped() {
+        ServerHttpRequest request = transformer.apply(from("203.0.113.7"));
+        assertThat(request.getRemoteAddress().getAddress().getHostAddress()).isEqualTo("203.0.113.7");
+        assertThat(request.getHeaders().containsKey("X-Forwarded-For")).isFalse();
+    }
+
+    @Test
+    void privateRanges() {
+        for (String ip : new String[]{"127.0.0.1", "10.30.0.13", "172.16.0.1", "192.168.1.1", "fd00::1", "::1", "fe80::1"}) {
+            assertThat(LoginGuardConfig.privatePeer(new InetSocketAddress(ip, 1))).as(ip).isTrue();
+        }
+        for (String ip : new String[]{"103.109.235.154", "172.32.0.1", "2001:db8::1", "8.8.8.8"}) {
+            assertThat(LoginGuardConfig.privatePeer(new InetSocketAddress(ip, 1))).as(ip).isFalse();
+        }
+    }
+}

backend/src/test/java/com/mailserver/controller/AuthenticationControllerTest.java

@@ -0,0 +1,81 @@
+package com.mailserver.controller;
+
+import com.mailserver.config.MailDomains;
+import com.mailserver.domain.User;
+import com.mailserver.dto.LoginRequest;
+import com.mailserver.security.LoginGuard;
+import com.mailserver.service.MailService;
+import com.mailserver.service.UserService;
+import com.mailserver.util.JwtUtils;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
+import reactor.core.publisher.Mono;
+
+import java.net.InetSocketAddress;
+import java.time.Duration;
+import java.util.Map;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+class AuthenticationControllerTest {
+
+    private final UserService users = mock(UserService.class);
+    private final JwtUtils jwt = mock(JwtUtils.class);
+    private final LoginGuard guard = new LoginGuard(new LoginGuard.Settings(true, 3, 100, Duration.ofMinutes(15),
+            Duration.ofMinutes(15), Duration.ofHours(24), Duration.ofDays(30), Set.of(), Duration.ZERO));
+    private final AuthenticationController controller = new AuthenticationController(users, mock(MailService.class), jwt,
+            mock(MailDomains.class), false, guard, mock(com.mailserver.config.MailAdmins.class));
+
+    private final User alice = new User();
+
+    AuthenticationControllerTest() {
+        alice.setEmail("alice@x.test");
+        alice.setPassword("hash");
+        when(users.findByEmail("alice@x.test")).thenReturn(Mono.just(alice));
+        when(users.findByEmail("ghost@x.test")).thenReturn(Mono.empty());
+        when(users.checkPassword(eq(alice), anyString())).thenAnswer(i -> "secret".equals(i.getArgument(1)));
+        when(jwt.generateToken(any())).thenReturn("token");
+    }
+
+    private ResponseEntity<?> login(String ip, String email, String password) {
+        LoginRequest request = new LoginRequest();
+        request.setEmail(email);
+        request.setPassword(password);
+        MockServerHttpRequest http = MockServerHttpRequest.post("/api/login")
+                .remoteAddress(new InetSocketAddress(ip, 40000)).build();
+        return controller.login(Mono.just(request), http).block();
+    }
+
+    @Test
+    void unknownMailboxAndWrongPasswordLookTheSameAndBothCount() {
+        assertThat(login("1.2.3.4", "ghost@x.test", "x").getBody()).isEqualTo(Map.of("error", "Invalid credentials"));
+        assertThat(login("1.2.3.4", "alice@x.test", "x").getBody()).isEqualTo(Map.of("error", "Invalid credentials"));
+        login("1.2.3.4", "alice@x.test", "y");
+
+        ResponseEntity<?> blocked = login("1.2.3.4", "alice@x.test", "secret");
+        assertThat(blocked.getStatusCode()).isEqualTo(HttpStatus.TOO_MANY_REQUESTS);
+        assertThat(blocked.getHeaders().getFirst("Retry-After")).isEqualTo("900");
+        assertThat(blocked.getBody()).isEqualTo(Map.of("error", "Too many failed logins, try again in 15 min"));
+
+        assertThat(login("5.6.7.8", "alice@x.test", "secret").getStatusCode()).isEqualTo(HttpStatus.OK);
+    }
+
+    @Test
+    void blockedAttemptDoesNotCheckThePassword() {
+        for (int i = 0; i < 3; i++) {
+            login("1.2.3.4", "ghost@x.test", "x");
+        }
+        login("1.2.3.4", "alice@x.test", "secret");
+        verify(users, never()).checkPassword(any(), eq("secret"));
+    }
+}

backend/src/test/java/com/mailserver/controller/MailboxAdminControllerTest.java

@@ -0,0 +1,143 @@
+package com.mailserver.controller;
+
+import com.mailserver.config.MailAdmins;
+import com.mailserver.config.MailDomains;
+import com.mailserver.domain.User;
+import com.mailserver.service.MailService;
+import com.mailserver.service.UserService;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.server.ResponseStatusException;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/** Settings → Mailboxes: only administrators; mailboxes only in our domains; a generated password comes back once. */
+class MailboxAdminControllerTest {
+
+    private final UserService users = mock(UserService.class);
+    private final MailService mail = mock(MailService.class);
+    private final MailDomains domains = new MailDomains("jambocheck.com", "");
+    private final MailAdmins admins = new MailAdmins("", "", domains);
+    private final com.mailserver.util.JwtUtils jwt = mock(com.mailserver.util.JwtUtils.class);
+    private final MailboxAdminController controller = new MailboxAdminController(users, mail, domains, admins, jwt);
+
+    private final User admin = user(1L, "admin@jambocheck.com");
+    private final User alice = user(2L, "alice@jambocheck.com");
+
+    MailboxAdminControllerTest() {
+        when(mail.usedBytes(anyLong())).thenReturn(Mono.just(0L));
+        when(users.all()).thenReturn(Flux.just(alice, admin));
+        when(users.byId(1L)).thenReturn(Mono.just(admin));
+        when(users.byId(2L)).thenReturn(Mono.just(alice));
+        when(users.byId(99L)).thenReturn(Mono.empty());
+        when(users.register(anyString(), anyString(), any())).thenAnswer(i -> Mono.just(user(3L, i.getArgument(0))));
+        when(users.setPassword(any(), anyString())).thenAnswer(i -> Mono.just((User) i.getArgument(0)));
+        when(users.setActive(any(), any(Boolean.class))).thenAnswer(i -> {
+            User u = i.getArgument(0);
+            u.setActive(i.getArgument(1));
+            return Mono.just(u);
+        });
+    }
+
+    @Test
+    void administratorIsTheFirstMailboxByDefault() {
+        assertThat(admins.isAdmin("ADMIN@jambocheck.com")).isTrue();
+        assertThat(admins.isAdmin("alice@jambocheck.com")).isFalse();
+        assertThat(new MailAdmins("ops@jambocheck.com, root@jambocheck.com", "admin@jambocheck.com", domains).isAdmin("admin@jambocheck.com")).isFalse();
+    }
+
+    @Test
+    void listsMailboxesSortedForAnAdministratorOnly() {
+        List<MailboxAdminController.MailboxView> list = controller.list(as("admin@jambocheck.com")).collectList().block();
+        assertThat(list).extracting(MailboxAdminController.MailboxView::email).containsExactly("admin@jambocheck.com", "alice@jambocheck.com");
+        assertThat(list.get(0).admin()).isTrue();
+
+        assertThat(status(() -> controller.list(as("alice@jambocheck.com")).collectList().block())).isEqualTo(HttpStatus.FORBIDDEN);
+    }
+
+    @Test
+    void createsReservedNamesWithAGeneratedPasswordShownOnce() {
+        var created = controller.create(as("admin@jambocheck.com"),
+                Mono.just(new MailboxAdminController.CreateRequest(" No-Reply@JamboCheck.com ", "Jambotron", ""))).block();
+
+        assertThat(created.mailbox().email()).isEqualTo("no-reply@jambocheck.com");
+        assertThat(created.password()).hasSizeGreaterThanOrEqualTo(20);
+        verify(users).register(eq("no-reply@jambocheck.com"), eq(created.password()), eq("Jambotron"));
+
+        var chosen = controller.create(as("admin@jambocheck.com"),
+                Mono.just(new MailboxAdminController.CreateRequest("monitor@jambocheck.com", null, "long-enough-1"))).block();
+        assertThat(chosen.password()).isNull();
+    }
+
+    @Test
+    void refusesOtherDomainsBadAddressesShortPasswordsAndNonAdmins() {
+        assertThat(status(() -> create("admin@jambocheck.com", "x@gmail.com", ""))).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(status(() -> create("admin@jambocheck.com", "bad address@jambocheck.com", ""))).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(status(() -> create("admin@jambocheck.com", "x@jambocheck.com", "short"))).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(status(() -> create("alice@jambocheck.com", "x@jambocheck.com", ""))).isEqualTo(HttpStatus.FORBIDDEN);
+        verify(users, never()).register(anyString(), anyString(), any());
+
+        when(users.register(eq("alice@jambocheck.com"), anyString(), any())).thenReturn(Mono.error(new IllegalArgumentException("exists")));
+        assertThat(status(() -> create("admin@jambocheck.com", "alice@jambocheck.com", ""))).isEqualTo(HttpStatus.CONFLICT);
+    }
+
+    @Test
+    void newPasswordAndSwitchOffButNotYourself() {
+        var reset = controller.password(as("admin@jambocheck.com"), 2L, Mono.just(new MailboxAdminController.PasswordRequest(null))).block();
+        assertThat(reset.password()).isNotBlank();
+        verify(users).setPassword(alice, reset.password());
+
+        assertThat(controller.active(as("admin@jambocheck.com"), 2L, Mono.just(new MailboxAdminController.ActiveRequest(false))).block().active()).isFalse();
+        assertThat(status(() -> controller.active(as("admin@jambocheck.com"), 1L, Mono.just(new MailboxAdminController.ActiveRequest(false))).block()))
+                .isEqualTo(HttpStatus.BAD_REQUEST);
+    }
+
+    @Test
+    void administratorOpensAnyMailboxOthersCanNot() {
+        when(jwt.generateToken("alice@jambocheck.com")).thenReturn("alice-token");
+
+        var session = controller.open(as("admin@jambocheck.com"), 2L).block();
+        assertThat(session.getEmail()).isEqualTo("alice@jambocheck.com");
+        assertThat(session.getToken()).isEqualTo("alice-token");
+
+        assertThat(status(() -> controller.open(as("alice@jambocheck.com"), 1L).block())).isEqualTo(HttpStatus.FORBIDDEN);
+        assertThat(status(() -> controller.open(as("admin@jambocheck.com"), 99L).block())).isEqualTo(HttpStatus.NOT_FOUND);
+    }
+
+    private MailboxAdminController.Created create(String me, String email, String password) {
+        return controller.create(as(me), Mono.just(new MailboxAdminController.CreateRequest(email, null, password))).block();
+    }
+
+    private static Mono<Authentication> as(String email) {
+        return Mono.just(new UsernamePasswordAuthenticationToken(email, null, List.of()));
+    }
+
+    private static HttpStatus status(Runnable call) {
+        Throwable error = org.assertj.core.api.Assertions.catchThrowable(call::run);
+        assertThat(error).isInstanceOf(ResponseStatusException.class);
+        return HttpStatus.valueOf(((ResponseStatusException) error).getStatusCode().value());
+    }
+
+    private static User user(Long id, String email) {
+        User user = new User();
+        user.setId(id);
+        user.setEmail(email);
+        user.setPassword("hash");
+        return user;
+    }
+}

backend/src/test/java/com/mailserver/imap/ImapServerTest.java

@@ -0,0 +1,373 @@
+package com.mailserver.imap;
+
+import com.mailserver.smtp.SmtpTls;
+import jakarta.mail.BodyPart;
+import jakarta.mail.Flags;
+import jakarta.mail.Folder;
+import jakarta.mail.Message;
+import jakarta.mail.Multipart;
+import jakarta.mail.Session;
+import jakarta.mail.Store;
+import jakarta.mail.UIDFolder;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeMessage;
+import jakarta.mail.search.SubjectTerm;
+import org.eclipse.angus.mail.imap.AppendUID;
+import org.eclipse.angus.mail.imap.IMAPFolder;
+import com.mailserver.security.LoginGuard;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
+import java.security.cert.X509Certificate;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Properties;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ImapServerTest {
+
+    static final String PLAIN = """
+            From: Bob <bob@elsewhere.test>
+            To: alice@example.test
+            Subject: Hello Alice
+            Date: Thu, 05 Nov 2026 10:00:00 +0000
+            Message-ID: <hello@elsewhere.test>
+            Content-Type: text/plain; charset=utf-8
+
+            Hi there, line one.
+            Line two.
+            """;
+
+    static final String WITH_FILE = """
+            From: =?UTF-8?B?0JDQvdC90LA=?= <anna@elsewhere.test>
+            To: alice@example.test
+            Subject: =?UTF-8?B?0J7RgtGH0ZHRgg==?=
+            Date: Thu, 05 Nov 2026 11:00:00 +0000
+            MIME-Version: 1.0
+            Content-Type: multipart/mixed; boundary="b1"
+
+            preamble
+            --b1
+            Content-Type: text/plain; charset=utf-8
+
+            See the report.
+            --b1
+            Content-Type: application/pdf; name="report.pdf"
+            Content-Disposition: attachment; filename="report.pdf"
+            Content-Transfer-Encoding: base64
+
+            JVBERi0xLjQgdGVzdA==
+            --b1--
+            """;
+
+    @TempDir
+    Path tlsDir;
+
+    private MemoryImapStore store;
+    private ImapServer server;
+
+    @BeforeEach
+    void start() throws Exception {
+        store = new MemoryImapStore();
+        store.deliver("INBOX", PLAIN);
+        store.deliver("INBOX", WITH_FILE);
+        server = new ImapServer(new ImapServer.Settings("127.0.0.1", 0, "mx.example.test", false,
+                SmtpTls.serverContext(null, null, tlsDir, "mx.example.test"), false, 1_000_000,
+                Duration.ofMinutes(5), Duration.ofMillis(200)), store);
+        server.start();
+    }
+
+    @AfterEach
+    void stop() {
+        server.stop();
+    }
+
+    private Store connect() throws Exception {
+        Properties props = new Properties();
+        props.put("mail.imap.host", "127.0.0.1");
+        props.put("mail.imap.port", String.valueOf(server.port()));
+        props.put("mail.imap.starttls.enable", "true");
+        props.put("mail.imap.starttls.required", "true");
+        props.put("mail.imap.ssl.trust", "*");
+        props.put("mail.imap.ssl.checkserveridentity", "false");
+        Store imap = Session.getInstance(props).getStore("imap");
+        imap.connect("alice@example.test", "secret");
+        return imap;
+    }
+
+    @Test
+    void realClientReadsFoldersMessagesAndAttachments() throws Exception {
+        try (Store imap = connect()) {
+            List<String> names = Arrays.stream(imap.getDefaultFolder().list("*")).map(Folder::getFullName).toList();
+            assertThat(names).contains("INBOX", "Drafts", "Sent", "Spam", "Trash");
+
+            IMAPFolder inbox = (IMAPFolder) imap.getFolder("INBOX");
+            inbox.open(Folder.READ_WRITE);
+            assertThat(inbox.getMessageCount()).isEqualTo(2);
+            assertThat(inbox.getUnreadMessageCount()).isEqualTo(2);
+
+            Message first = inbox.getMessage(1);
+            assertThat(first.getSubject()).isEqualTo("Hello Alice");
+            assertThat(((InternetAddress) first.getFrom()[0]).getPersonal()).isEqualTo("Bob");
+            assertThat(first.getContent().toString()).contains("Line two.");
+            assertThat(first.isSet(Flags.Flag.SEEN)).isTrue(); // BODY[] without PEEK
+
+            Message second = inbox.getMessage(2);
+            assertThat(second.getSubject()).isEqualTo("Отчёт");
+            assertThat(((InternetAddress) second.getFrom()[0]).getPersonal()).isEqualTo("Анна");
+            Multipart parts = (Multipart) second.getContent(); // BODYSTRUCTURE, then BODY[1] and BODY[2]
+            assertThat(parts.getCount()).isEqualTo(2);
+            assertThat(parts.getBodyPart(0).getContent().toString()).contains("See the report.");
+            BodyPart file = parts.getBodyPart(1);
+            assertThat(file.getFileName()).isEqualTo("report.pdf");
+            assertThat(new String(file.getInputStream().readAllBytes(), StandardCharsets.US_ASCII)).isEqualTo("%PDF-1.4 test");
+
+            assertThat(inbox.search(new SubjectTerm("hello"))).hasSize(1);
+            assertThat(inbox.getUID(first)).isEqualTo(1);
+            assertThat(inbox.getMessageByUID(2).getSubject()).isEqualTo("Отчёт");
+        }
+    }
+
+    @Test
+    void appendCopyMoveAndExpunge() throws Exception {
+        try (Store imap = connect()) {
+            IMAPFolder sent = (IMAPFolder) imap.getFolder("Sent");
+            MimeMessage outgoing = new MimeMessage(Session.getInstance(new Properties()));
+            outgoing.setFrom(new InternetAddress("alice@example.test"));
+            outgoing.setRecipient(Message.RecipientType.TO, new InternetAddress("bob@elsewhere.test"));
+            outgoing.setSubject("Sent from Thunderbird");
+            outgoing.setText("body");
+            AppendUID[] appended = sent.appendUIDMessages(new Message[]{outgoing});
+            assertThat(appended[0].uid).isEqualTo(1);
+            assertThat(appended[0].uidvalidity).isEqualTo(store.box("Sent").uidValidity());
+
+            IMAPFolder inbox = (IMAPFolder) imap.getFolder("INBOX");
+            inbox.open(Folder.READ_WRITE);
+            inbox.copyMessages(new Message[]{inbox.getMessage(1)}, imap.getFolder("Trash"));
+            inbox.moveMessages(new Message[]{inbox.getMessage(2)}, imap.getFolder("Spam"));
+            inbox.close(false); // JavaMail counts EXPUNGEd messages until the folder is opened again
+            inbox.open(Folder.READ_WRITE);
+            assertThat(inbox.getMessageCount()).isEqualTo(1);
+
+            inbox.getMessage(1).setFlag(Flags.Flag.DELETED, true);
+            inbox.expunge();
+            assertThat(inbox.getMessageCount()).isZero();
+        }
+        assertThat(store.entries(store.box("Trash").id())).hasSize(1);
+        assertThat(store.entries(store.box("Spam").id())).hasSize(1);
+        assertThat(store.entries(store.box("Sent").id())).hasSize(1);
+    }
+
+    @Test
+    void createRenameAndDeleteFolders() throws Exception {
+        try (Store imap = connect()) {
+            Folder projects = imap.getFolder("Проекты");
+            assertThat(projects.create(Folder.HOLDS_MESSAGES)).isTrue();
+            assertThat(Arrays.stream(imap.getDefaultFolder().list("*")).map(Folder::getFullName)).contains("Проекты");
+            assertThat(projects.renameTo(imap.getFolder("Archive"))).isTrue();
+            assertThat(imap.getFolder("Archive").delete(false)).isTrue();
+            assertThat(imap.getFolder("Archive").exists()).isFalse();
+        }
+    }
+
+    @Test
+    void wrongPasswordsCloseTheConnectionAndTheGuardBlocksTheIp() throws Exception {
+        server.stop();
+        LoginGuard guard = new LoginGuard(new LoginGuard.Settings(true, 4, 100, Duration.ofMinutes(15),
+                Duration.ofMinutes(15), Duration.ofHours(24), Duration.ofDays(30), java.util.Set.of(), Duration.ZERO));
+        server = new ImapServer(new ImapServer.Settings("127.0.0.1", 0, "mx.example.test", false,
+                SmtpTls.serverContext(null, null, tlsDir, "mx.example.test"), false, 1_000_000,
+                Duration.ofMinutes(5), Duration.ofMillis(200)), store, guard);
+        server.start();
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.tls("s");
+            assertThat(client.send("a LOGIN alice@example.test w1")).startsWith("a NO [AUTHENTICATIONFAILED]");
+            assertThat(client.send("b LOGIN alice@example.test w2")).startsWith("b NO [AUTHENTICATIONFAILED]");
+            assertThat(client.untilTagged("c", "c LOGIN alice@example.test w3")).contains("* BYE Too many failed logins");
+            assertThat(client.read()).isNull();
+        }
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.tls("s");
+            assertThat(client.send("a LOGIN alice@example.test w4")).startsWith("a NO [AUTHENTICATIONFAILED]");
+            assertThat(client.untilTagged("b", "b LOGIN alice@example.test secret"))
+                    .anyMatch(line -> line.startsWith("* BYE Too many failed logins, try again in 15 min"))
+                    .anyMatch(line -> line.startsWith("b NO [UNAVAILABLE]"));
+        }
+    }
+
+    @Test
+    void loginIsRefusedInPlainTextAndTheGreetingSaysSo() throws Exception {
+        try (Client client = new Client(server.port())) {
+            String greeting = client.read();
+            assertThat(greeting).contains("STARTTLS").contains("LOGINDISABLED").doesNotContain("AUTH=PLAIN");
+            assertThat(client.send("a LOGIN alice@example.test secret")).startsWith("a NO [PRIVACYREQUIRED]");
+        }
+    }
+
+    @Test
+    void literalsAndLiteralPlus() throws Exception {
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.tls("s");
+            client.write("a LOGIN {18}\r\n");
+            assertThat(client.read()).startsWith("+ ");
+            client.write("alice@example.test {6+}\r\nsecret\r\n");
+            assertThat(client.read()).startsWith("a OK");
+            String message = "Subject: via literal+\r\n\r\nhi\r\n";
+            client.write("b APPEND Drafts (\\Seen) {" + message.length() + "+}\r\n" + message + "\r\n");
+            assertThat(client.read()).startsWith("b OK [APPENDUID");
+        }
+        assertThat(store.entries(store.box("Drafts").id())).hasSize(1);
+    }
+
+    @Test
+    void idleReportsNewMailUntilDone() throws Exception {
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.tls("s");
+            client.send("a LOGIN alice@example.test secret");
+            client.untilTagged("b", "b SELECT INBOX");
+            client.write("c IDLE\r\n");
+            assertThat(client.read()).startsWith("+ idling");
+            store.deliver("INBOX", PLAIN);
+            assertThat(client.read()).isEqualTo("* 3 EXISTS");
+            client.write("DONE\r\n");
+            assertThat(client.read()).startsWith("c OK");
+            assertThat(client.send("d NOOP")).startsWith("d OK");
+        }
+    }
+
+    // CVE-2011-0411 class: commands sent in plain text right after STARTTLS must not run inside TLS
+    @Test
+    void plainTextAfterStartTlsIsNotExecuted() throws Exception {
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.write("s STARTTLS\r\nx LOGIN alice@example.test secret\r\n");
+            assertThat(client.read()).startsWith("s OK");
+            String reply;
+            try {
+                client.startTls();
+                reply = client.read();
+            } catch (java.io.IOException closed) {
+                reply = null; // the server closed the connection — the expected outcome
+            }
+            assertThat(reply).isNull();
+        }
+    }
+
+    @Test
+    void sectionsOfANestedMessage() {
+        String raw = ("Subject: outer\r\nContent-Type: multipart/mixed; boundary=x\r\n\r\n"
+                + "--x\r\nContent-Type: text/plain\r\n\r\nouter text\r\n"
+                + "--x\r\nContent-Type: message/rfc822\r\n\r\nSubject: inner\r\nContent-Type: text/plain\r\n\r\ninner text\r\n"
+                + "--x--\r\n");
+        MimeTree tree = MimeTree.parse(raw.getBytes(StandardCharsets.US_ASCII));
+        assertThat(text(ImapSession.section(tree, "1"))).isEqualTo("outer text");
+        assertThat(text(ImapSession.section(tree, "2.HEADER"))).isEqualTo("Subject: inner\r\nContent-Type: text/plain\r\n\r\n");
+        assertThat(text(ImapSession.section(tree, "2.TEXT"))).isEqualTo("inner text");
+        assertThat(text(ImapSession.section(tree, "2.1"))).isEqualTo("inner text");
+        assertThat(text(ImapSession.section(tree, "1.MIME"))).isEqualTo("Content-Type: text/plain\r\n\r\n");
+        assertThat(text(ImapSession.section(tree, "HEADER.FIELDS (SUBJECT)"))).isEqualTo("Subject: outer\r\n\r\n");
+        assertThat(text(ImapSession.section(tree, ""))).isEqualTo(raw);
+    }
+
+    @Test
+    void mailboxNamesUseModifiedUtf7() {
+        // the example of RFC 3501 5.1.3
+        assertThat(ImapWriter.encodeMailbox("~peter/mail/台北/日本語")).isEqualTo("~peter/mail/&U,BTFw-/&ZeVnLIqe-");
+        assertThat(ImapWriter.decodeMailbox("~peter/mail/&U,BTFw-/&ZeVnLIqe-")).isEqualTo("~peter/mail/台北/日本語");
+        assertThat(ImapWriter.decodeMailbox(ImapWriter.encodeMailbox("Проекты & план"))).isEqualTo("Проекты & план");
+    }
+
+    private static String text(byte[] bytes) {
+        return new String(bytes, StandardCharsets.UTF_8);
+    }
+
+    /** Line-oriented IMAP test client. */
+    static final class Client implements AutoCloseable {
+        private Socket socket;
+        private BufferedReader in;
+        private OutputStream out;
+
+        Client(int port) throws Exception {
+            socket = new Socket("127.0.0.1", port);
+            socket.setSoTimeout(5000);
+            in = new BufferedReader(new InputStreamReader(socket.getInputStream(), StandardCharsets.UTF_8));
+            out = socket.getOutputStream();
+        }
+
+        void write(String text) throws Exception {
+            out.write(text.getBytes(StandardCharsets.UTF_8));
+            out.flush();
+        }
+
+        String read() throws Exception {
+            return in.readLine();
+        }
+
+        String send(String line) throws Exception {
+            write(line + "\r\n");
+            return read();
+        }
+
+        /** Sends a command, returns all lines up to its tagged response. */
+        List<String> untilTagged(String tag, String line) throws Exception {
+            write(line + "\r\n");
+            List<String> lines = new ArrayList<>();
+            String next;
+            do {
+                next = read();
+                lines.add(next);
+            } while (next != null && !next.startsWith(tag + " "));
+            return lines;
+        }
+
+        void tls(String tag) throws Exception {
+            assertThat(send(tag + " STARTTLS")).startsWith(tag + " OK");
+            startTls();
+        }
+
+        void startTls() throws Exception {
+            SSLContext context = SSLContext.getInstance("TLS");
+            context.init(null, new TrustManager[]{new X509TrustManager() {
+                public void checkClientTrusted(X509Certificate[] chain, String authType) {
+                }
+
+                public void checkServerTrusted(X509Certificate[] chain, String authType) {
+                }
+
+                public X509Certificate[] getAcceptedIssuers() {
+                    return new X509Certificate[0];
+                }
+            }}, null);
+            SSLSocket ssl = (SSLSocket) context.getSocketFactory().createSocket(socket, "127.0.0.1", socket.getPort(), true);
+            ssl.setUseClientMode(true);
+            ssl.startHandshake();
+            socket = ssl;
+            in = new BufferedReader(new InputStreamReader(ssl.getInputStream(), StandardCharsets.UTF_8));
+            out = ssl.getOutputStream();
+        }
+
+        @Override
+        public void close() throws Exception {
+            socket.close();
+        }
+    }
+}

backend/src/test/java/com/mailserver/imap/MemoryImapStore.java

@@ -0,0 +1,172 @@
+package com.mailserver.imap;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.atomic.AtomicLong;
+
+/** In-memory {@link ImapStore}: one user alice@example.test / secret with the system folders. */
+class MemoryImapStore implements ImapStore {
+
+    static final class Stored {
+        final long id;
+        volatile long folderId;
+        volatile long uid;
+        volatile boolean seen;
+        volatile boolean flagged;
+        volatile boolean answered;
+        volatile boolean deleted;
+        final Instant date;
+        final byte[] raw;
+
+        Stored(long id, long folderId, long uid, byte[] raw, Instant date) {
+            this.id = id;
+            this.folderId = folderId;
+            this.uid = uid;
+            this.raw = raw;
+            this.date = date;
+        }
+
+        Entry entry() {
+            return new Entry(id, uid, seen, flagged, answered, deleted, date);
+        }
+    }
+
+    private final AtomicLong ids = new AtomicLong(100);
+    final List<Mailbox> boxes = new CopyOnWriteArrayList<>();
+    final Map<Long, Long> uidNext = new ConcurrentHashMap<>();
+    final List<Stored> messages = new CopyOnWriteArrayList<>();
+
+    MemoryImapStore() {
+        for (String name : List.of("INBOX", "Drafts", "Sent", "Spam", "Trash")) {
+            addBox(name, true);
+        }
+    }
+
+    private Mailbox addBox(String name, boolean system) {
+        long id = ids.incrementAndGet();
+        uidNext.put(id, 1L);
+        Mailbox box = new Mailbox(id, name, system, 1700000000L + id, 1);
+        boxes.add(box);
+        return box;
+    }
+
+    Mailbox box(String name) {
+        return boxes.stream().filter(b -> b.name().equals(name)).findFirst().orElseThrow();
+    }
+
+    /** Delivers a message into a folder, as SMTP would. */
+    synchronized Stored deliver(String folder, String raw) {
+        Mailbox box = box(folder);
+        Stored stored = new Stored(ids.incrementAndGet(), box.id(), nextUid(box.id()),
+                raw.replace("\n", "\r\n").replace("\r\r\n", "\r\n").getBytes(), Instant.parse("2026-11-05T10:00:00Z"));
+        messages.add(stored);
+        return stored;
+    }
+
+    private synchronized long nextUid(long folderId) {
+        long uid = uidNext.get(folderId);
+        uidNext.put(folderId, uid + 1);
+        return uid;
+    }
+
+    @Override
+    public Account authenticate(String username, String password) {
+        return "alice@example.test".equalsIgnoreCase(username) && "secret".equals(password)
+                ? new Account(1, "alice@example.test") : null;
+    }
+
+    @Override
+    public List<Mailbox> mailboxes(long userId) {
+        return boxes.stream().map(b -> new Mailbox(b.id(), b.name(), b.system(), b.uidValidity(), uidNext.get(b.id()))).toList();
+    }
+
+    @Override
+    public synchronized Mailbox create(long userId, String name) {
+        return addBox(name, false);
+    }
+
+    @Override
+    public synchronized void rename(long userId, Mailbox mailbox, String newName) {
+        boxes.removeIf(b -> b.id() == mailbox.id());
+        boxes.add(new Mailbox(mailbox.id(), newName, false, mailbox.uidValidity(), mailbox.uidNext()));
+    }
+
+    @Override
+    public synchronized void delete(long userId, Mailbox mailbox) {
+        Mailbox trash = box("Trash");
+        move(userId, entries(mailbox.id()), trash);
+        boxes.removeIf(b -> b.id() == mailbox.id());
+    }
+
+    @Override
+    public List<Entry> entries(long folderId) {
+        return messages.stream().filter(m -> m.folderId == folderId)
+                .sorted((a, b) -> Long.compare(a.uid, b.uid)).map(Stored::entry).toList();
+    }
+
+    @Override
+    public byte[] source(long messageId) {
+        return find(messageId).raw;
+    }
+
+    private Stored find(long id) {
+        return messages.stream().filter(m -> m.id == id).findFirst().orElseThrow();
+    }
+
+    @Override
+    public void setFlags(long messageId, boolean seen, boolean flagged, boolean answered, boolean deleted) {
+        Stored m = find(messageId);
+        m.seen = seen;
+        m.flagged = flagged;
+        m.answered = answered;
+        m.deleted = deleted;
+    }
+
+    @Override
+    public synchronized long append(long userId, Mailbox target, byte[] raw, boolean seen, boolean flagged,
+                                    boolean answered, boolean deleted, Instant internalDate) {
+        Stored stored = new Stored(ids.incrementAndGet(), target.id(), nextUid(target.id()), raw,
+                internalDate == null ? Instant.now() : internalDate);
+        stored.seen = seen;
+        stored.flagged = flagged;
+        stored.answered = answered;
+        stored.deleted = deleted;
+        messages.add(stored);
+        return stored.uid;
+    }
+
+    @Override
+    public synchronized List<Long> copy(long userId, List<Entry> list, Mailbox target) {
+        List<Long> uids = new ArrayList<>();
+        for (Entry entry : list) {
+            Stored from = find(entry.id());
+            Stored copy = new Stored(ids.incrementAndGet(), target.id(), nextUid(target.id()), from.raw, from.date);
+            copy.seen = from.seen;
+            copy.flagged = from.flagged;
+            messages.add(copy);
+            uids.add(copy.uid);
+        }
+        return uids;
+    }
+
+    @Override
+    public synchronized List<Long> move(long userId, List<Entry> list, Mailbox target) {
+        List<Long> uids = new ArrayList<>();
+        for (Entry entry : list) {
+            Stored m = find(entry.id());
+            m.folderId = target.id();
+            m.uid = nextUid(target.id());
+            uids.add(m.uid);
+        }
+        return uids;
+    }
+
+    @Override
+    public void expunge(List<Long> messageIds) {
+        messages.removeIf(m -> messageIds.contains(m.id));
+    }
+}

backend/src/test/java/com/mailserver/security/LoginGuardTest.java

@@ -0,0 +1,164 @@
+package com.mailserver.security;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class LoginGuardTest {
+
+    /** Clock the test moves by hand. */
+    static final class TestClock extends Clock {
+        Instant now = Instant.parse("2026-11-06T12:00:00Z");
+
+        void plus(Duration d) {
+            now = now.plus(d);
+        }
+
+        @Override
+        public ZoneOffset getZone() {
+            return ZoneOffset.UTC;
+        }
+
+        @Override
+        public Clock withZone(java.time.ZoneId zone) {
+            return this;
+        }
+
+        @Override
+        public Instant instant() {
+            return now;
+        }
+    }
+
+    private final TestClock clock = new TestClock();
+
+    private LoginGuard guard(int perIp, int perAccount, String... trusted) {
+        return new LoginGuard(new LoginGuard.Settings(true, perIp, perAccount, Duration.ofMinutes(15),
+                Duration.ofMinutes(15), Duration.ofHours(24), Duration.ofDays(30), Set.of(trusted), Duration.ZERO), clock);
+    }
+
+    @Test
+    void ipIsBlockedAfterTheLimitWhateverMailboxItTries() {
+        LoginGuard guard = guard(3, 100);
+        for (int i = 0; i < 2; i++) {
+            guard.failure("1.2.3.4", "user" + i + "@x.test");
+        }
+        assertThat(guard.blocked("1.2.3.4", "any@x.test")).isFalse();
+        guard.failure("1.2.3.4", "user9@x.test");
+        assertThat(guard.retryAfter("1.2.3.4", "any@x.test")).isEqualTo(Duration.ofMinutes(15));
+        assertThat(guard.blocked("5.6.7.8", "any@x.test")).isFalse();
+
+        clock.plus(Duration.ofMinutes(15));
+        assertThat(guard.blocked("1.2.3.4", "any@x.test")).isFalse();
+    }
+
+    @Test
+    void failuresOutsideTheWindowDoNotCount() {
+        LoginGuard guard = guard(3, 100);
+        guard.failure("1.2.3.4", "a@x.test");
+        guard.failure("1.2.3.4", "a@x.test");
+        clock.plus(Duration.ofMinutes(16));
+        guard.failure("1.2.3.4", "a@x.test");
+        assertThat(guard.blocked("1.2.3.4", "a@x.test")).isFalse();
+    }
+
+    @Test
+    void eachNextBlockOfTheSameIpIsTwiceAsLongUpToTheMaximum() {
+        LoginGuard guard = guard(2, 100);
+        Duration expected = Duration.ofMinutes(15);
+        for (int round = 0; round < 10; round++) {
+            guard.failure("1.2.3.4", "a@x.test");
+            guard.failure("1.2.3.4", "a@x.test");
+            Duration wait = guard.retryAfter("1.2.3.4", "b@x.test");
+            assertThat(wait).isEqualTo(expected);
+            clock.plus(wait);
+            expected = expected.multipliedBy(2).compareTo(Duration.ofHours(24)) > 0 ? Duration.ofHours(24) : expected.multipliedBy(2);
+        }
+        // a quiet day forgives
+        clock.plus(Duration.ofHours(25));
+        guard.failure("1.2.3.4", "a@x.test");
+        guard.failure("1.2.3.4", "a@x.test");
+        assertThat(guard.retryAfter("1.2.3.4", "b@x.test")).isEqualTo(Duration.ofMinutes(15));
+    }
+
+    @Test
+    void attemptsWhileBlockedDoNotProlongTheBlock() {
+        LoginGuard guard = guard(2, 100);
+        guard.failure("1.2.3.4", "a@x.test");
+        guard.failure("1.2.3.4", "a@x.test");
+        clock.plus(Duration.ofMinutes(10));
+        guard.failure("1.2.3.4", "a@x.test");
+        assertThat(guard.retryAfter("1.2.3.4", "a@x.test")).isEqualTo(Duration.ofMinutes(5));
+    }
+
+    @Test
+    void distributedAttackBlocksTheMailboxButNotItsOwnerFromAKnownIp() {
+        LoginGuard guard = guard(100, 5);
+        guard.success("10.0.0.7", "Alice@X.test");
+        for (int i = 0; i < 5; i++) {
+            guard.failure("203.0.113." + i, "alice@x.test");
+        }
+        assertThat(guard.blocked("198.51.100.1", "alice@x.test")).isTrue();
+        assertThat(guard.blocked("198.51.100.1", "bob@x.test")).isFalse();
+        assertThat(guard.blocked("10.0.0.7", "alice@x.test")).isFalse();
+    }
+
+    @Test
+    void successForgivesTheIpFailuresButNotAnActiveBlock() {
+        LoginGuard guard = guard(3, 100);
+        guard.failure("1.2.3.4", "a@x.test");
+        guard.failure("1.2.3.4", "a@x.test");
+        guard.success("1.2.3.4", "a@x.test");
+        guard.failure("1.2.3.4", "a@x.test");
+        guard.failure("1.2.3.4", "a@x.test");
+        assertThat(guard.blocked("1.2.3.4", "a@x.test")).isFalse();
+        guard.failure("1.2.3.4", "a@x.test");
+        assertThat(guard.blocked("1.2.3.4", "a@x.test")).isTrue();
+        guard.success("1.2.3.4", "a@x.test");
+        assertThat(guard.blocked("1.2.3.4", "other@x.test")).isTrue();
+    }
+
+    @Test
+    void trustedIpIsNeverBlockedByIp() {
+        LoginGuard guard = guard(2, 100, "172.18.0.1");
+        for (int i = 0; i < 10; i++) {
+            guard.failure("172.18.0.1", "u" + i + "@x.test");
+        }
+        assertThat(guard.blocked("172.18.0.1", "new@x.test")).isFalse();
+    }
+
+    @Test
+    void sweepForgetsOldKeys() {
+        LoginGuard guard = guard(5, 5);
+        guard.failure("1.2.3.4", "a@x.test");
+        assertThat(guard.trackedIps()).isEqualTo(1);
+        assertThat(guard.trackedAccounts()).isEqualTo(1);
+        clock.plus(Duration.ofHours(25).plusMinutes(16));
+        guard.sweep();
+        assertThat(guard.trackedIps()).isZero();
+        assertThat(guard.trackedAccounts()).isZero();
+    }
+
+    @Test
+    void disabledGuardNeverBlocks() {
+        LoginGuard guard = LoginGuard.disabled();
+        for (int i = 0; i < 100; i++) {
+            guard.failure("1.2.3.4", "a@x.test");
+        }
+        assertThat(guard.blocked("1.2.3.4", "a@x.test")).isFalse();
+        assertThat(guard.failureDelay()).isZero();
+    }
+
+    @Test
+    void humanDuration() {
+        assertThat(LoginGuard.human(Duration.ofSeconds(30))).isEqualTo("1 min");
+        assertThat(LoginGuard.human(Duration.ofMinutes(15))).isEqualTo("15 min");
+        assertThat(LoginGuard.human(Duration.ofHours(4))).isEqualTo("4 h");
+    }
+}

backend/src/test/java/com/mailserver/service/SubmissionServiceTest.java

@@ -0,0 +1,84 @@
+package com.mailserver.service;
+
+import com.mailserver.domain.Attachment;
+import com.mailserver.domain.User;
+import com.mailserver.dto.SendRequest;
+import jakarta.mail.Message;
+import jakarta.mail.Session;
+import jakarta.mail.internet.MimeMessage;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Properties;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class SubmissionServiceTest {
+
+    @Test
+    void addressesAreSplitLowercasedAndDeduplicated() {
+        assertThat(SubmissionService.addresses(" Bob@Mail.test, alice@mail.test;bob@mail.test  carol@x.org "))
+                .containsExactly("bob@mail.test", "alice@mail.test", "carol@x.org");
+        assertThat(SubmissionService.addresses(null)).isEmpty();
+        assertThat(SubmissionService.addresses("  ")).isEmpty();
+    }
+
+    @Test
+    void malformedAddressIsRejected() {
+        assertThatThrownBy(() -> SubmissionService.addresses("bob@mail.test, not-an-address"))
+                .isInstanceOf(ResponseStatusException.class)
+                .hasMessageContaining("not-an-address");
+    }
+
+    @Test
+    void attachmentsGoIntoTheMessageAndComeBackOutOnDelivery(@TempDir Path dir) throws Exception {
+        Path file = dir.resolve("report.pdf");
+        Files.writeString(file, "%PDF-1.4 test");
+        Attachment attachment = new Attachment();
+        attachment.setFilename("Отчёт 2026.pdf");
+        attachment.setContentType("application/pdf");
+        attachment.setFilePath(file.toString());
+
+        User user = new User();
+        user.setEmail("admin@mail.test");
+        user.setDisplayName("Admin");
+        SendRequest request = new SendRequest();
+        request.setSubject("Report");
+        request.setBody("See the file");
+
+        MimeMessage mime = SubmissionService.mime(user, List.of("bob@mail.test"), List.of("carol@mail.test"), request,
+                List.of(attachment));
+        ByteArrayOutputStream raw = new ByteArrayOutputStream();
+        mime.writeTo(raw);
+
+        MimeMessage parsed = new MimeMessage(Session.getInstance(new Properties()), new ByteArrayInputStream(raw.toByteArray()));
+        assertThat(parsed.getRecipients(Message.RecipientType.CC)[0].toString()).isEqualTo("carol@mail.test");
+        assertThat(LocalDelivery.addresses(parsed, Message.RecipientType.TO)).isEqualTo("bob@mail.test");
+        assertThat(LocalDelivery.addresses(parsed, Message.RecipientType.CC)).isEqualTo("carol@mail.test");
+        assertThat(LocalDelivery.body(parsed).text()).isEqualTo("See the file");
+        List<LocalDelivery.FilePart> files = LocalDelivery.attachments(parsed);
+        assertThat(files).hasSize(1);
+        assertThat(files.get(0).name()).isEqualTo("Отчёт 2026.pdf");
+        assertThat(files.get(0).contentType()).isEqualTo("application/pdf");
+        assertThat(new String(files.get(0).bytes(), StandardCharsets.UTF_8)).isEqualTo("%PDF-1.4 test");
+    }
+
+    @Test
+    void plainMessageHasNoAttachments() throws Exception {
+        User user = new User();
+        user.setEmail("admin@mail.test");
+        SendRequest request = new SendRequest();
+        request.setBody("Hi");
+        MimeMessage mime = SubmissionService.mime(user, List.of("bob@mail.test"), List.of(), request, List.of());
+        assertThat(LocalDelivery.attachments(mime)).isEmpty();
+        assertThat(LocalDelivery.body(mime).text()).isEqualTo("Hi");
+    }
+}

backend/src/test/java/com/mailserver/smtp/MailRouterTest.java

@@ -0,0 +1,68 @@
+package com.mailserver.smtp;
+
+import com.mailserver.config.MailDomains;
+import com.mailserver.delivery.OutboundQueue;
+import com.mailserver.delivery.SmtpDeliveryClient;
+import com.mailserver.repository.UserRepository;
+import com.mailserver.service.DkimService;
+import com.mailserver.service.LocalDelivery;
+import com.mailserver.service.UserService;
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Mono;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/** Mail trap (75.4): existing mailboxes keep their mail, everything else goes into the catch-all mailbox. */
+class MailRouterTest {
+
+    private final UserRepository users = mock(UserRepository.class);
+    private final LocalDelivery localDelivery = mock(LocalDelivery.class);
+    private final OutboundQueue queue = mock(OutboundQueue.class);
+    private final SmtpDeliveryClient client = mock(SmtpDeliveryClient.class);
+
+    private MailRouter router(String catchAll) {
+        when(users.existsByEmail(anyString())).thenReturn(Mono.just(false));
+        when(users.existsByEmail("bob@mail.test")).thenReturn(Mono.just(true));
+        when(client.mode()).thenReturn(SmtpDeliveryClient.Mode.OFF);
+        return new MailRouter(new MailDomains("mail.test", catchAll), users, mock(UserService.class), localDelivery,
+                queue, mock(DkimService.class), client);
+    }
+
+    @Test
+    void withoutCatchAllUnknownAndOutsideAddressesAreRefused() {
+        MailRouter router = router("");
+
+        assertThat(router.route("bob@mail.test", null)).isEqualTo(SmtpBackend.Route.LOCAL);
+        assertThat(router.route("nobody@mail.test", null)).isEqualTo(SmtpBackend.Route.UNKNOWN_USER);
+        assertThat(router.route("user@gmail.com", null)).isEqualTo(SmtpBackend.Route.RELAY_DENIED);
+        assertThat(router.route("user@gmail.com", "bob@mail.test")).isEqualTo(SmtpBackend.Route.OUTBOUND_DISABLED);
+    }
+
+    @Test
+    void catchAllTakesEverythingWithoutItsOwnMailboxButExistingMailboxesKeepTheirMail() throws Exception {
+        MailRouter router = router("trap@mail.test");
+
+        assertThat(router.route("nobody@mail.test", null)).isEqualTo(SmtpBackend.Route.LOCAL);
+        assertThat(router.route("user@gmail.com", null)).isEqualTo(SmtpBackend.Route.LOCAL);
+        assertThat(router.mailbox("bob@mail.test")).isEqualTo("bob@mail.test");
+        assertThat(router.mailbox("user@gmail.com")).isEqualTo("trap@mail.test");
+
+        router.accept(new SmtpBackend.Envelope("10.0.0.5", "staging", "no-reply@jambotron.com", null, List.of(
+                new SmtpBackend.Recipient("user@gmail.com", SmtpBackend.Route.LOCAL),
+                new SmtpBackend.Recipient("bob@mail.test", SmtpBackend.Route.LOCAL))), "Subject: hi\r\n\r\nbody".getBytes());
+
+        verify(localDelivery).deliver(any(), eq("trap@mail.test"), eq("10.0.0.5"), eq("no-reply@jambotron.com"), anyBoolean());
+        verify(localDelivery).deliver(any(), eq("bob@mail.test"), eq("10.0.0.5"), eq("no-reply@jambotron.com"), anyBoolean());
+        verify(queue, never()).enqueue(any(), any(), any());
+    }
+}

backend/src/test/java/com/mailserver/smtp/ReloadingKeyManagerTest.java

@@ -0,0 +1,149 @@
+package com.mailserver.smtp;
+
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
+import org.bouncycastle.cert.jcajce.JcaX509v3CertificateBuilder;
+import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
+import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.StringWriter;
+import java.math.BigInteger;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.FileTime;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.cert.X509Certificate;
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.util.Date;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ReloadingKeyManagerTest {
+
+    /** A clock moved by hand */
+    static final class TestClock extends Clock {
+        Instant now = Instant.parse("2026-11-06T12:00:00Z");
+
+        @Override
+        public ZoneOffset getZone() {
+            return ZoneOffset.UTC;
+        }
+
+        @Override
+        public Clock withZone(java.time.ZoneId zone) {
+            return this;
+        }
+
+        @Override
+        public Instant instant() {
+            return now;
+        }
+    }
+
+    @Test
+    void readsTheFilesAgainWhenTheyChange(@TempDir Path dir) throws Exception {
+        Path cert = dir.resolve("cert.pem");
+        Path key = dir.resolve("key.pem");
+        SmtpTls.selfSigned("old.example", cert, key);
+        TestClock clock = new TestClock();
+        ReloadingKeyManager manager = new ReloadingKeyManager(cert, key, Duration.ofMinutes(1), clock);
+
+        String first = manager.chooseEngineServerAlias("RSA", null, null);
+        assertEquals("CN=old.example", subject(manager.getCertificateChain(first)));
+        assertNull(manager.chooseEngineServerAlias("EC", null, null), "an RSA key is not offered for EC");
+
+        SmtpTls.selfSigned("new.example", cert, key);
+        Files.setLastModifiedTime(cert, FileTime.from(Instant.now().plusSeconds(5)));
+        Files.setLastModifiedTime(key, FileTime.from(Instant.now().plusSeconds(5)));
+
+        assertEquals(first, manager.chooseEngineServerAlias("RSA", null, null), "not checked before the interval");
+
+        clock.now = clock.now.plus(Duration.ofMinutes(1));
+        String second = manager.chooseEngineServerAlias("RSA", null, null);
+        assertNotEquals(first, second);
+        assertEquals("CN=new.example", subject(manager.getCertificateChain(second)));
+        assertNotNull(manager.getPrivateKey(second));
+        assertNotNull(manager.getCertificateChain(first), "a handshake that holds the previous alias still finishes");
+    }
+
+    @Test
+    void keepsTheOldCertificateWhenTheNewFileIsBroken(@TempDir Path dir) throws Exception {
+        Path cert = dir.resolve("cert.pem");
+        Path key = dir.resolve("key.pem");
+        SmtpTls.selfSigned("old.example", cert, key);
+        TestClock clock = new TestClock();
+        ReloadingKeyManager manager = new ReloadingKeyManager(cert, key, Duration.ofMinutes(1), clock);
+
+        Files.writeString(cert, "-----BEGIN CERTIFICATE-----\nhalf");
+        Files.setLastModifiedTime(cert, FileTime.from(Instant.now().plusSeconds(5)));
+        clock.now = clock.now.plus(Duration.ofMinutes(2));
+
+        String alias = manager.chooseEngineServerAlias("RSA", null, null);
+        assertEquals("CN=old.example", subject(manager.getCertificateChain(alias)));
+    }
+
+    @Test
+    void readsTraditionalEcKeysAsLegoWritesThem(@TempDir Path dir) throws Exception {
+        KeyPairGenerator generator = KeyPairGenerator.getInstance("EC");
+        generator.initialize(256);
+        KeyPair pair = generator.generateKeyPair();
+        X500Name name = new X500Name("CN=mail.example");
+        X509Certificate certificate = new JcaX509CertificateConverter().getCertificate(
+                new JcaX509v3CertificateBuilder(name, BigInteger.ONE, new Date(System.currentTimeMillis() - 86_400_000L),
+                        new Date(System.currentTimeMillis() + 86_400_000L), name, pair.getPublic())
+                        .build(new JcaContentSignerBuilder("SHA256withECDSA").build(pair.getPrivate())));
+        Path cert = dir.resolve("cert.pem");
+        Path key = dir.resolve("key.pem");
+        Files.writeString(cert, pem(certificate));
+        Files.writeString(key, sec1(pair)); // -----BEGIN EC PRIVATE KEY----- (SEC1 with the curve), not PKCS#8
+        assertTrue(Files.readString(key).contains("EC PRIVATE KEY"));
+
+        ReloadingKeyManager manager = new ReloadingKeyManager(cert, key, Duration.ofMinutes(1), new TestClock());
+        String alias = manager.chooseEngineServerAlias("EC", null, null);
+        assertNotNull(alias);
+        assertEquals("EC", manager.getPrivateKey(alias).getAlgorithm());
+        assertNull(manager.chooseEngineServerAlias("RSA", null, null));
+    }
+
+    @Test
+    void refusesAKeyThatDoesNotMatchTheCertificateType(@TempDir Path dir) throws Exception {
+        Path cert = dir.resolve("cert.pem");
+        Path key = dir.resolve("key.pem");
+        SmtpTls.selfSigned("rsa.example", cert, key);
+        KeyPairGenerator generator = KeyPairGenerator.getInstance("EC");
+        generator.initialize(256);
+        Files.writeString(key, sec1(generator.generateKeyPair()));
+        assertThrows(IllegalStateException.class,
+                () -> new ReloadingKeyManager(cert, key, Duration.ofMinutes(1), new TestClock()));
+    }
+
+    /** As lego and openssl ecparam -genkey write it: SEC1 with the named curve secp256r1 */
+    private static String sec1(KeyPair pair) throws Exception {
+        java.security.interfaces.ECPrivateKey key = (java.security.interfaces.ECPrivateKey) pair.getPrivate();
+        org.bouncycastle.asn1.sec.ECPrivateKey sec1 = new org.bouncycastle.asn1.sec.ECPrivateKey(256, key.getS(),
+                new org.bouncycastle.asn1.x9.X962Parameters(org.bouncycastle.asn1.sec.SECObjectIdentifiers.secp256r1));
+        StringWriter out = new StringWriter();
+        try (org.bouncycastle.util.io.pem.PemWriter writer = new org.bouncycastle.util.io.pem.PemWriter(out)) {
+            writer.writeObject(new org.bouncycastle.util.io.pem.PemObject("EC PRIVATE KEY", sec1.getEncoded()));
+        }
+        return out.toString();
+    }
+
+    private static String subject(X509Certificate[] chain) {
+        return chain[0].getSubjectX500Principal().getName();
+    }
+
+    private static String pem(Object object) throws Exception {
+        StringWriter out = new StringWriter();
+        try (JcaPEMWriter writer = new JcaPEMWriter(out)) {
+            writer.writeObject(object);
+        }
+        return out.toString();
+    }
+}

backend/src/test/java/com/mailserver/smtp/SmtpServerTest.java

@@ -5,14 +5,22 @@ import jakarta.mail.Session;
 import jakarta.mail.Transport;
 import jakarta.mail.internet.InternetAddress;
 import jakarta.mail.internet.MimeMessage;
+import com.mailserver.security.LoginGuard;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.net.Socket;
+import java.nio.file.Path;
+import java.security.cert.X509Certificate;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
 import java.nio.charset.StandardCharsets;
 import java.time.Duration;
 import java.util.ArrayList;
@@ -151,6 +159,34 @@ class SmtpServerTest {
         assertThat(backend.messages.get(0)).contains("with ESMTPA;");
     }
 
+    @Test
+    void threeWrongPasswordsCloseTheConnectionAndTheGuardBlocksTheIp() throws Exception {
+        server.stop();
+        LoginGuard guard = new LoginGuard(new LoginGuard.Settings(true, 4, 100, Duration.ofMinutes(15),
+                Duration.ofMinutes(15), Duration.ofHours(24), Duration.ofDays(30), java.util.Set.of(), Duration.ZERO));
+        server = new SmtpServer(new SmtpServer.Settings("127.0.0.1", 0, "mx.example.test", 2000, true,
+                Duration.ofSeconds(30)), backend, guard);
+        server.start();
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.send("EHLO laptop");
+            client.readReplyLines();
+            assertThat(client.send("AUTH PLAIN " + b64("\0alice@example.test\0w1"))).startsWith("535");
+            assertThat(client.send("AUTH PLAIN " + b64("\0alice@example.test\0w2"))).startsWith("535");
+            assertThat(client.send("AUTH PLAIN " + b64("\0alice@example.test\0w3"))).startsWith("535").contains("closing");
+            assertThat(client.read()).isNull();
+        }
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.send("EHLO laptop");
+            client.readReplyLines();
+            assertThat(client.send("AUTH PLAIN " + b64("\0bob@example.test\0w4"))).startsWith("535");
+            // 4th failure from 127.0.0.1: blocked — even the right password is not checked
+            assertThat(client.send("AUTH PLAIN " + b64("\0alice@example.test\0secret"))).startsWith("421 4.7.0");
+            assertThat(client.read()).isNull();
+        }
+    }
+
     @Test
     void authLoginWorksToo() throws Exception {
         try (Client client = new Client(server.port())) {
@@ -214,15 +250,131 @@ class SmtpServerTest {
         assertThat(SmtpServer.path("<a b@c>")).isNull();
     }
 
+    // ---------- TLS (75.1) ----------
+
+    @TempDir
+    Path tlsDir;
+
+    private SmtpServer tlsServer(boolean implicit) throws Exception {
+        server.stop();
+        server = new SmtpServer(new SmtpServer.Settings("127.0.0.1", 0, "mx.example.test", 2000, false,
+                Duration.ofSeconds(30), SmtpTls.serverContext(null, null, tlsDir, "mx.example.test"), implicit), backend);
+        server.start();
+        return server;
+    }
+
+    @Test
+    void startTlsThenAuthAndTheSessionStartsOver() throws Exception {
+        tlsServer(false);
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.send("EHLO laptop");
+            List<String> plain = client.readReplyLines();
+            assertThat(plain).contains("250-STARTTLS").noneMatch(line -> line.contains("AUTH"));
+            assertThat(client.send("AUTH PLAIN " + b64("\0alice@example.test\0secret"))).startsWith("538");
+            assertThat(client.send("MAIL FROM:<x@elsewhere.test>")).startsWith("250");
+
+            assertThat(client.send("STARTTLS")).isEqualTo("220 2.0.0 Ready to start TLS");
+            client.startTls();
+
+            // RFC 3207: MAIL FROM before STARTTLS is forgotten, EHLO again
+            assertThat(client.send("MAIL FROM:<x@elsewhere.test>")).startsWith("503");
+            client.send("EHLO laptop");
+            List<String> secure = client.readReplyLines();
+            assertThat(secure).contains("250-AUTH PLAIN LOGIN").noneMatch(line -> line.contains("STARTTLS"));
+            assertThat(client.send("STARTTLS")).startsWith("503");
+            assertThat(client.send("AUTH PLAIN " + b64("\0alice@example.test\0secret"))).startsWith("235");
+            client.send("MAIL FROM:<alice@example.test>");
+            client.send("RCPT TO:<friend@gmail.com>");
+            client.send("DATA");
+            assertThat(client.send("Subject: tls\r\n\r\nhi\r\n.")).startsWith("250");
+        }
+        assertThat(backend.messages.get(0)).contains("with ESMTPSA;");
+    }
+
+    // CVE-2011-0411: commands sent in plain text right after STARTTLS must not run inside the TLS session
+    @Test
+    void plainTextInjectedAfterStartTlsIsNotExecuted() throws Exception {
+        tlsServer(false);
+        try (Client client = new Client(server.port())) {
+            client.read();
+            client.send("EHLO laptop");
+            client.readReplyLines();
+            client.write("STARTTLS\r\nMAIL FROM:<x@elsewhere.test>\r\nRCPT TO:<bob@example.test>\r\n");
+            assertThat(client.read()).isEqualTo("220 2.0.0 Ready to start TLS");
+            client.startTls();
+            String reply = client.read();
+            assertThat(reply == null || reply.startsWith("421")).as(reply).isTrue();
+        }
+        assertThat(backend.envelopes).isEmpty();
+    }
+
+    @Test
+    void realClientRequiringStartTlsDelivers() throws Exception {
+        tlsServer(false);
+        Properties props = new Properties();
+        props.put("mail.smtp.host", "127.0.0.1");
+        props.put("mail.smtp.port", String.valueOf(server.port()));
+        props.put("mail.smtp.starttls.enable", "true");
+        props.put("mail.smtp.starttls.required", "true");
+        props.put("mail.smtp.ssl.trust", "*");
+        props.put("mail.smtp.ssl.checkserveridentity", "false"); // self-signed for mx.example.test, connecting to 127.0.0.1
+        props.put("mail.smtp.auth", "true");
+        Session session = Session.getInstance(props);
+        MimeMessage message = new MimeMessage(session);
+        message.setFrom(new InternetAddress("alice@example.test"));
+        message.setRecipient(Message.RecipientType.TO, new InternetAddress("bob@example.test"));
+        message.setSubject("Over STARTTLS");
+        message.setText("hello");
+
+        Transport.send(message, "alice@example.test", "secret");
+
+        assertThat(backend.envelopes).hasSize(1);
+        assertThat(backend.envelopes.get(0).authenticatedUser()).isEqualTo("alice@example.test");
+        assertThat(backend.messages.get(0)).contains("with ESMTPSA;");
+    }
+
+    @Test
+    void implicitTlsPortWorksWithoutStartTls() throws Exception {
+        tlsServer(true);
+        Properties props = new Properties();
+        props.put("mail.smtp.host", "127.0.0.1");
+        props.put("mail.smtp.port", String.valueOf(server.port()));
+        props.put("mail.smtp.ssl.enable", "true");
+        props.put("mail.smtp.ssl.trust", "*");
+        props.put("mail.smtp.ssl.checkserveridentity", "false"); // self-signed for mx.example.test, connecting to 127.0.0.1
+        props.put("mail.smtp.auth", "true");
+        Session session = Session.getInstance(props);
+        MimeMessage message = new MimeMessage(session);
+        message.setFrom(new InternetAddress("alice@example.test"));
+        message.setRecipient(Message.RecipientType.TO, new InternetAddress("bob@example.test"));
+        message.setSubject("Over 465");
+        message.setText("hello");
+
+        Transport.send(message, "alice@example.test", "secret");
+
+        assertThat(backend.messages.get(0)).contains("with ESMTPSA;");
+    }
+
+    @Test
+    void selfSignedCertificateIsCreatedOnceAndReused() throws Exception {
+        SmtpTls.serverContext(null, null, tlsDir, "mx.example.test");
+        String first = java.nio.file.Files.readString(tlsDir.resolve(SmtpTls.CERT_FILE));
+        SmtpTls.serverContext(null, null, tlsDir, "mx.example.test");
+
+        assertThat(java.nio.file.Files.readString(tlsDir.resolve(SmtpTls.CERT_FILE))).isEqualTo(first);
+        assertThat(java.nio.file.Files.readString(tlsDir.resolve(SmtpTls.KEY_FILE))).startsWith("-----BEGIN PRIVATE KEY-----");
+    }
+
     private static String b64(String text) {
         return Base64.getEncoder().encodeToString(text.getBytes(StandardCharsets.UTF_8));
     }
 
     /** Line-oriented test client. */
     static final class Client implements AutoCloseable {
-        private final Socket socket;
-        private final BufferedReader in;
-        private final OutputStream out;
+        private Socket socket;
+        private BufferedReader in;
+        private OutputStream out;
 
         Client(int port) throws Exception {
             socket = new Socket("127.0.0.1", port);
@@ -231,6 +383,28 @@ class SmtpServerTest {
             out = socket.getOutputStream();
         }
 
+        /** Upgrade the connection to TLS (any certificate is trusted — the test server's is self-signed). */
+        void startTls() throws Exception {
+            SSLContext context = SSLContext.getInstance("TLS");
+            context.init(null, new TrustManager[]{new X509TrustManager() {
+                public void checkClientTrusted(X509Certificate[] chain, String authType) {
+                }
+
+                public void checkServerTrusted(X509Certificate[] chain, String authType) {
+                }
+
+                public X509Certificate[] getAcceptedIssuers() {
+                    return new X509Certificate[0];
+                }
+            }}, null);
+            SSLSocket ssl = (SSLSocket) context.getSocketFactory().createSocket(socket, "127.0.0.1", socket.getPort(), true);
+            ssl.setUseClientMode(true);
+            ssl.startHandshake();
+            socket = ssl;
+            in = new BufferedReader(new InputStreamReader(ssl.getInputStream(), StandardCharsets.UTF_8));
+            out = ssl.getOutputStream();
+        }
+
         void write(String text) throws Exception {
             out.write(text.getBytes(StandardCharsets.UTF_8));
             out.flush();

docker-compose.image.yml

@@ -0,0 +1,84 @@
+# Same stand as docker-compose.jambotron.yml, but from the ready image — nothing is built on the VM:
+# gitea.jambotron.com/jambotron_gang/reactive-mail-server (Drone builds it from master, see .drone.yml).
+# Pin a build: MAIL_IMAGE_TAG=<first 8 chars of the master commit>; default latest (pulled again on every deploy).
+# Test deploy on Jambotron (v0.2.3 75.3): pick this file in the deploy wizard.
+# Outside, only the web client + API (service "mail", port 8080) through Jambotron's Caddy — give it a domain.
+# SMTP (3025) stays inside the VM's docker network; nothing is sent outside (OUTBOUND_MODE=off).
+# Secrets are generated on the first start into the "secrets" volume — nothing to type in, nothing in git.
+# Mailboxes admin@<MAIL_DOMAINS> and trap@mail.test (catch-all): passwords in the "mail" log on the first start
+# (Jambotron: project → Services → mail → Logs) and in /app/data/initial-passwords.txt
+# of the "mail" container (docker exec <mail container> cat /app/data/initial-passwords.txt).
+name: reactive-mail
+
+services:
+  secrets-init:
+    image: alpine:3.20
+    restart: "no"
+    command:
+      - sh
+      - -c
+      - |
+        umask 077
+        for name in DB_PASSWORD JWT_SECRET; do
+          [ -s /secrets/$$name ] || head -c 48 /dev/urandom | base64 | tr -dc 'A-Za-z0-9' > /secrets/$$name
+        done
+        # postgres reads it as uid 70, the app as uid 10001 — readable inside these containers only
+        chmod 644 /secrets/DB_PASSWORD /secrets/JWT_SECRET
+    volumes:
+      - secrets:/secrets
+
+  db:
+    # Debian, not -alpine: on Jambotron staging VMs (Alpine 3.24, kernel 6.18) the Alpine build of postgres
+    # dies with "Bus error" even on --version; the Debian build works (2026-11-05)
+    image: postgres:17
+    restart: unless-stopped
+    depends_on:
+      secrets-init:
+        condition: service_completed_successfully
+    environment:
+      POSTGRES_DB: mailserver
+      POSTGRES_USER: mail
+      POSTGRES_PASSWORD_FILE: /run/mail-secrets/DB_PASSWORD
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+      - secrets:/run/mail-secrets:ro
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U mail -d mailserver"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+    mem_limit: 256m
+
+  mail:
+    image: gitea.jambotron.com/jambotron_gang/reactive-mail-server:${MAIL_IMAGE_TAG:-latest}
+    pull_policy: always
+    restart: unless-stopped
+    depends_on:
+      db:
+        condition: service_healthy
+    expose:
+      - "8080"   # web client + API → domain in Jambotron
+      - "3025"   # SMTP, inside the network only
+      - "3143"   # IMAP (STARTTLS), inside the network only — open it in Jambotron as an internal TCP port
+    environment:
+      DB_HOST: db
+      MAILSERVER_SECRETS_DIR: /run/mail-secrets
+      MAIL_DOMAINS: ${MAIL_DOMAINS:-mail.test}
+      MAIL_HOSTNAME: ${MAIL_HOSTNAME:-mail.test}
+      DKIM_DOMAIN: ${MAIL_DOMAINS:-mail.test}
+      # mail trap: mail to any address without its own mailbox here (also gmail.com etc.) goes into this mailbox
+      MAIL_CATCH_ALL: ${MAIL_CATCH_ALL:-trap@mail.test}
+      MAIL_REGISTRATION: ${MAIL_REGISTRATION:-true}   # test stand: anyone can create a mailbox in MAIL_DOMAINS (nothing goes outside)
+      OUTBOUND_MODE: "off"
+      SMTP_AUTH_WITHOUT_TLS: "true"   # SMTP is not reachable from outside the VM
+      SPF_ENABLED: "false"
+      DMARC_ENABLED: "false"
+    volumes:
+      - data:/app/data
+      - secrets:/run/mail-secrets:ro
+    mem_limit: 512m
+
+volumes:
+  secrets:
+  pgdata:
+  data:

docker-compose.jambotron.yml

@@ -2,7 +2,9 @@
 # Outside, only the web client + API (service "mail", port 8080) through Jambotron's Caddy — give it a domain.
 # SMTP (3025) stays inside the VM's docker network; nothing is sent outside (OUTBOUND_MODE=off).
 # Secrets are generated on the first start into the "secrets" volume — nothing to type in, nothing in git.
-# The first mailbox (admin@<MAIL_DOMAINS>) and its password: in the "mail" logs on the first start.
+# Mailboxes admin@<MAIL_DOMAINS> and trap@mail.test (catch-all): passwords in the "mail" log on the first start
+# (Jambotron: project → Services → mail → Logs) and in /app/data/initial-passwords.txt
+# of the "mail" container (docker exec <mail container> cat /app/data/initial-passwords.txt).
 name: reactive-mail
 
 services:
@@ -55,13 +57,16 @@ services:
     expose:
       - "8080"   # web client + API → domain in Jambotron
       - "3025"   # SMTP, inside the network only
+      - "3143"   # IMAP (STARTTLS), inside the network only — open it in Jambotron as an internal TCP port
     environment:
       DB_HOST: db
       MAILSERVER_SECRETS_DIR: /run/mail-secrets
       MAIL_DOMAINS: ${MAIL_DOMAINS:-mail.test}
       MAIL_HOSTNAME: ${MAIL_HOSTNAME:-mail.test}
       DKIM_DOMAIN: ${MAIL_DOMAINS:-mail.test}
-      MAIL_CATCH_ALL: ${MAIL_CATCH_ALL:-}
+      # mail trap: mail to any address without its own mailbox here (also gmail.com etc.) goes into this mailbox
+      MAIL_CATCH_ALL: ${MAIL_CATCH_ALL:-trap@mail.test}
+      MAIL_REGISTRATION: ${MAIL_REGISTRATION:-true}   # test stand: anyone can create a mailbox in MAIL_DOMAINS (nothing goes outside)
       OUTBOUND_MODE: "off"
       SMTP_AUTH_WITHOUT_TLS: "true"   # SMTP is not reachable from outside the VM
       SPF_ENABLED: "false"

docker-compose.public.yml

@@ -0,0 +1,159 @@
+# Real mail on the internet (v0.2.3 75.6): receives mail for MAIL_DOMAINS and sends it straight to the recipients'
+# MX servers (port 25), DKIM-signed. From the ready image, like docker-compose.image.yml.
+#
+# Needs a VM of its own with a public address (Jambotron 60.8: «Публичный адрес» of the VM, SMTP «да» — port 25
+# is closed by default) — the ports below are published on that address:
+#   25   SMTP: mail from other servers (STARTTLS) and from mail programs
+#   587  submission: mail programs (STARTTLS + login) — the same SMTP listener as 25
+#   465  SMTPS: mail programs, implicit TLS
+#   993  IMAPS: mail programs, implicit TLS
+#   80   only for Let's Encrypt (HTTP-01) — service "acme"
+#   443  web client + API over HTTPS, same Let's Encrypt certificate (acme): https://mail.jambocheck.com
+# The web client + API can also go through Jambotron's Caddy (plain port 8080) under ANOTHER name
+# (webmail.<domain>): the name MAIL_HOSTNAME points at the VM's public address, not at Caddy.
+#
+# DNS before the first start (the certificate is issued over HTTP on MAIL_HOSTNAME):
+#   A    mail.<domain>             → public address of the VM
+#   PTR  public address            → mail.<domain>        (hoster's panel: Reverse DNS)
+#   MX   <domain>                  → 10 mail.<domain>
+#   TXT  <domain>                  → "v=spf1 ip4:<public address> -all"
+#   TXT  _dmarc.<domain>           → "v=DMARC1; p=none; rua=mailto:postmaster@<domain>"
+#   TXT  mail._domainkey.<domain>  → printed in the "mail" log on the first start (DKIM key, kept in the data volume)
+#
+# Mailbox admin@<domain>: its password is in the "mail" log on the first start and in /app/data/initial-passwords.txt.
+# Registration is closed: new mailboxes only by the admin. No catch-all.
+# Defaults are ours (mail.jambocheck.com / jambocheck.com) — Jambotron deploys without a .env; another domain:
+# MAIL_HOSTNAME, MAIL_DOMAINS, ACME_EMAIL in .env next to this file.
+name: reactive-mail-public
+
+services:
+  secrets-init:
+    image: alpine:3.20
+    restart: "no"
+    command:
+      - sh
+      - -c
+      - |
+        umask 077
+        for name in DB_PASSWORD JWT_SECRET; do
+          [ -s /secrets/$$name ] || head -c 48 /dev/urandom | base64 | tr -dc 'A-Za-z0-9' > /secrets/$$name
+        done
+        chmod 644 /secrets/DB_PASSWORD /secrets/JWT_SECRET
+    volumes:
+      - secrets:/secrets
+
+  # Let's Encrypt for MAIL_HOSTNAME: issued on the first start, renewed 30 days before the end (checked twice a day).
+  # The deploy hook copies the pair to /tls (readable by the "mail" user 10001); the server reads it again within
+  # a minute — no restart
+  acme:
+    image: goacme/lego:v5.5.2
+    restart: unless-stopped
+    ports:
+      - "80:80"
+    entrypoint:
+      - sh
+      - -c
+      - |
+        cat > /usr/local/bin/jb-deploy <<'EOF'
+        #!/bin/sh
+        set -e
+        cp "$$LEGO_HOOK_CERT_PATH" /tls/cert.pem.new
+        cp "$$LEGO_HOOK_CERT_KEY_PATH" /tls/key.pem.new
+        chown 10001 /tls/cert.pem.new /tls/key.pem.new
+        chmod 600 /tls/key.pem.new
+        chmod 644 /tls/cert.pem.new
+        mv /tls/key.pem.new /tls/key.pem
+        mv /tls/cert.pem.new /tls/cert.pem
+        echo "certificate for $$LEGO_HOOK_CERT_DOMAINS copied to /tls"
+        EOF
+        chmod 755 /usr/local/bin/jb-deploy
+        while true; do
+          /lego run --accept-tos --email "$$ACME_EMAIL" --domains "$$MAIL_HOSTNAME" --key-type EC256 \
+            --http --http.address :80 --path /var/lib/lego --renew-days 30 --no-random-sleep \
+            --deploy-hook /usr/local/bin/jb-deploy || echo "lego failed — next try in 1 hour"
+          [ -s /tls/cert.pem ] && sleep 43200 || sleep 3600
+        done
+    environment:
+      MAIL_HOSTNAME: ${MAIL_HOSTNAME:-mail.jambocheck.com}
+      ACME_EMAIL: ${ACME_EMAIL:-postmaster@jambocheck.com}
+      LEGO_LOG_FORMAT: text
+    volumes:
+      - lego:/var/lib/lego
+      - tls:/tls
+    healthcheck:
+      test: ["CMD-SHELL", "test -s /tls/cert.pem && test -s /tls/key.pem"]
+      interval: 15s
+      timeout: 5s
+      start_period: 10m
+      retries: 3
+    mem_limit: 128m
+
+  db:
+    image: postgres:17
+    restart: unless-stopped
+    depends_on:
+      secrets-init:
+        condition: service_completed_successfully
+    environment:
+      POSTGRES_DB: mailserver
+      POSTGRES_USER: mail
+      POSTGRES_PASSWORD_FILE: /run/mail-secrets/DB_PASSWORD
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+      - secrets:/run/mail-secrets:ro
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U mail -d mailserver"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+    mem_limit: 256m
+
+  mail:
+    image: gitea.jambotron.com/jambotron_gang/reactive-mail-server:${MAIL_IMAGE_TAG:-latest}
+    pull_policy: always
+    restart: unless-stopped
+    depends_on:
+      db:
+        condition: service_healthy
+      acme:
+        condition: service_healthy   # waits for the first certificate
+    ports:
+      - "25:3025"
+      - "587:3025"
+      - "465:3465"
+      - "993:3993"
+      - "443:8443"   # web client + API over HTTPS: https://mail.jambocheck.com
+    expose:
+      - "8080"   # plain HTTP, for a reverse proxy inside the network (not needed on the public address)
+    environment:
+      DB_HOST: db
+      MAILSERVER_SECRETS_DIR: /run/mail-secrets
+      MAIL_DOMAINS: ${MAIL_DOMAINS:-jambocheck.com}
+      MAIL_HOSTNAME: ${MAIL_HOSTNAME:-mail.jambocheck.com}
+      MAIL_TLS_CERT: /tls/cert.pem
+      MAIL_TLS_KEY: /tls/key.pem
+      SMTPS_PORT: "3465"
+      IMAPS_PORT: "3993"
+      HTTPS_PORT: "8443"
+      DKIM_DOMAIN: ${MAIL_DOMAINS:-jambocheck.com}
+      DKIM_SELECTOR: mail
+      DKIM_KEYS_DIR: /app/data/dkim-keys
+      MAIL_CATCH_ALL: ""
+      MAIL_REGISTRATION: "false"
+      OUTBOUND_MODE: mx
+      SMTP_AUTH_WITHOUT_TLS: "false"
+      IMAP_AUTH_WITHOUT_TLS: "false"
+      SPF_ENABLED: "true"
+      DMARC_ENABLED: "true"
+    volumes:
+      - data:/app/data
+      - secrets:/run/mail-secrets:ro
+      - tls:/tls:ro
+    mem_limit: 512m
+
+volumes:
+  secrets:
+  pgdata:
+  data:
+  lego:
+  tls:

frontend/.npmrc

@@ -0,0 +1 @@
+@jambotron:registry=https://gitea.jambotron.com/api/packages/jambotron_gang/npm/

frontend/angular.json

@@ -50,6 +50,7 @@
               }
             ],
             "styles": [
+              "src/material.scss",
               "src/styles.css"
             ]
           },
@@ -58,13 +59,13 @@
               "budgets": [
                 {
                   "type": "initial",
-                  "maximumWarning": "500kB",
-                  "maximumError": "1MB"
+                  "maximumWarning": "1MB",
+                  "maximumError": "2MB"
                 },
                 {
                   "type": "anyComponentStyle",
-                  "maximumWarning": "4kB",
-                  "maximumError": "8kB"
+                  "maximumWarning": "8kB",
+                  "maximumError": "16kB"
                 }
               ],
               "outputHashing": "all"
@@ -95,4 +96,4 @@
       }
     }
   }
-}
+}

frontend/package.json

@@ -11,12 +11,16 @@
   "private": true,
   "packageManager": "npm@11.17.0",
   "dependencies": {
+    "@angular/aria": "^22.2.6",
+    "@angular/cdk": "^22.2.6",
     "@angular/common": "^22.2.0",
     "@angular/compiler": "^22.2.0",
     "@angular/core": "^22.2.0",
     "@angular/forms": "^22.2.0",
+    "@angular/material": "^22.2.6",
     "@angular/platform-browser": "^22.2.0",
     "@angular/router": "^22.2.0",
+    "@jambotron/aria-grid": "0.1.0",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0"
   },

frontend/src/app/app.config.ts

@@ -1,13 +1,15 @@
 import { ApplicationConfig, provideBrowserGlobalErrorListeners } from '@angular/core';
-import { provideRouter, withHashLocation } from '@angular/router';
+import { provideRouter, withComponentInputBinding } from '@angular/router';
 import { provideHttpClient, withInterceptors } from '@angular/common/http';
 import { routes } from './app.routes';
-import { authInterceptor } from './interceptors/auth.interceptor';
+import { authInterceptor } from './core/auth';
+import { provideMailGrid } from './ui/grid';
 
 export const appConfig: ApplicationConfig = {
   providers: [
     provideBrowserGlobalErrorListeners(),
-    provideRouter(routes),
-    provideHttpClient(withInterceptors([authInterceptor]))
+    provideRouter(routes, withComponentInputBinding()),
+    provideHttpClient(withInterceptors([authInterceptor])),
+    provideMailGrid()
   ]
 };

frontend/src/app/app.routes.ts

@@ -1,43 +1,23 @@
 import { Routes } from '@angular/router';
+import { authGuard, guestGuard } from './core/auth';
 
 export const routes: Routes = [
-  {
-    path: 'login',
-    loadComponent: () => import('./components/login/login.component'),
-  },
-  {
-    path: 'register',
-    loadComponent: () => import('./components/register/register.component'),
-  },
+  { path: 'login', canActivate: [guestGuard], loadComponent: () => import('./pages/auth/login.page').then(m => m.LoginPage) },
+  { path: 'register', canActivate: [guestGuard], loadComponent: () => import('./pages/auth/register.page').then(m => m.RegisterPage) },
   {
     path: '',
-    loadComponent: () => import('./components/layout/layout.component'),
+    canActivate: [authGuard],
+    loadComponent: () => import('./pages/shell/shell.component').then(m => m.ShellComponent),
     children: [
-      {
-        path: 'inbox',
-        loadComponent: () => import('./components/inbox/inbox.component'),
-      },
-      {
-        path: 'compose',
-        loadComponent: () => import('./components/compose/compose.component'),
-      },
-      {
-        path: 'message/:id',
-        loadComponent: () => import('./components/message-detail/message-detail.component'),
-      },
-      {
-        path: 'contacts',
-        loadComponent: () => import('./components/contacts/contacts.component'),
-      },
-      {
-        path: '',
-        redirectTo: 'inbox',
-        pathMatch: 'full',
-      },
-    ],
-  },
-  {
-    path: '**',
-    redirectTo: 'login',
+      { path: '', pathMatch: 'full', loadComponent: () => import('./pages/inbox-redirect').then(m => m.InboxRedirect) },
+      { path: 'folder/:id', loadComponent: () => import('./pages/folder/folder.page').then(m => m.FolderPage) },
+      { path: 'message/:id', loadComponent: () => import('./pages/message/message.page').then(m => m.MessagePage) },
+      { path: 'compose', loadComponent: () => import('./pages/compose/compose.page').then(m => m.ComposePage) },
+      { path: 'contacts', loadComponent: () => import('./pages/contacts/contacts.page').then(m => m.ContactsPage) },
+      { path: 'blocked', loadComponent: () => import('./pages/blocked/blocked.page').then(m => m.BlockedPage) },
+      { path: 'settings', loadComponent: () => import('./pages/settings/settings.page').then(m => m.SettingsPage) }
+    ]
   },
+  { path: '**', redirectTo: '' }
 ];
+

frontend/src/app/app.ts

@@ -1,10 +1,14 @@
-import { Component } from '@angular/core';
+import { Component, inject } from '@angular/core';
 import { RouterOutlet } from '@angular/router';
+import { OverlaysComponent } from './ui/overlays.component';
+import { ThemeService } from './ui/theme.service';
 
 @Component({
-  imports: [RouterOutlet],
+  imports: [RouterOutlet, OverlaysComponent],
   selector: 'app-root',
-  template: `<router-outlet />`,
-  styles: ``
+  template: `<router-outlet /><app-overlays />`
 })
-export class App {}
+export class App {
+  // applies the remembered palette before the first page renders
+  private theme = inject(ThemeService);
+}

frontend/src/app/components/compose/compose.component.ts

@@ -1,121 +0,0 @@
-import { Component, inject } from '@angular/core';
-import { RouterLink } from '@angular/router';
-import { FormsModule } from '@angular/forms';
-import { MailService } from '../../services/mail.service';
-import { Router, ActivatedRoute } from '@angular/router';
-
-@Component({
-  selector: 'app-compose',
-  standalone: true,
-  imports: [RouterLink, FormsModule],
-  providers: [MailService],
-  template: `
-    <div class="glass-panel p-6">
-      <h2 class="text-lg font-orbitron font-bold text-cyan-500 mb-6 flex items-center gap-2">
-        <i class="fa-solid fa-pen-to-square text-pink-500"></i> COMPOSE MESSAGE
-      </h2>
-
-      @if (success) {
-        <div class="mb-4 p-3 rounded-lg bg-cyan-500/20 border border-cyan-500/40 text-cyan-500 text-sm font-mono">
-          Message sent successfully!
-        </div>
-      }
-
-      <form (ngSubmit)="onSend()" class="space-y-4">
-        <div>
-          <label for="to" class="block text-xs font-mono text-cyan-500 mb-1">TO</label>
-          <input id="to" type="email" [(ngModel)]="to" name="to" required
-            class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-500 transition-all"
-            placeholder="recipient@example.com">
-        </div>
-
-        <div>
-          <label for="subject" class="block text-xs font-mono text-cyan-500 mb-1">SUBJECT</label>
-          <input id="subject" type="text" [(ngModel)]="subject" name="subject" required
-            class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-500 transition-all"
-            placeholder="Enter subject...">
-        </div>
-
-        <div>
-          <div class="flex items-center justify-between mb-1">
-            <label for="body" class="text-xs font-mono text-cyan-500">BODY</label>
-            <label class="flex items-center gap-2 cursor-pointer">
-              <span class="text-xs font-mono text-slate-400">HTML</span>
-              <input type="checkbox" [(ngModel)]="isHtml" name="isHtml" class="sr-only">
-              <span class="w-10 h-5 rounded-full bg-slate-900/50 border border-cyan-500/30 relative transition-all"
-                [class.bg-cyan-500/30]="isHtml" [class.border-cyan-500]="isHtml">
-                <span class="absolute top-0.5 left-0.5 w-3.5 h-3.5 rounded-full bg-cyan-500 transition-all"
-                  [class.translate-x-5]="isHtml"></span>
-              </span>
-            </label>
-          </div>
-          <textarea id="body" [(ngModel)]="body" name="body" rows="10" required
-            class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-500 transition-all resize-none"
-            [placeholder]="isHtml ? 'Write HTML or Markdown...' : 'Write your message...'"></textarea>
-          @if (isHtml) {
-            <p class="text-xs text-slate-500 font-mono mt-1"><i class="fa-solid fa-lightbulb mr-1"></i>Supports Markdown: **bold**, *italic*, - lists, &nbsp;code&nbsp;</p>
-          }
-        </div>
-
-        <div class="flex gap-3 pt-4">
-          <button type="submit" [disabled]="sending"
-            class="cyber-btn px-8 py-3 rounded-xl text-sm font-bold">
-            <i class="fa-solid fa-paper-plane mr-1"></i> {{ sending ? 'SENDING...' : 'SEND' }}
-          </button>
-          <a routerLink="/inbox" class="px-6 py-3 rounded-xl text-xs font-mono text-slate-400 border border-slate-600 hover:text-slate-200 hover:border-slate-400 transition-all text-center">
-            CANCEL
-          </a>
-        </div>
-      </form>
-    </div>
-  `,
-  styles: ``
-})
-export default class ComposeComponent {
-  private mailService = inject(MailService);
-  private router = inject(Router);
-  private route = inject(ActivatedRoute);
-
-  to = '';
-  subject = '';
-  body = '';
-  isHtml = false;
-  sending = false;
-  success = false;
-
-  constructor() {
-    // Поддержка Reply и Forward через queryParams
-    this.route.queryParams.subscribe(params => {
-      if (params['replyTo']) {
-        this.to = params['replyTo'];
-      }
-      if (params['subject']) {
-        this.subject = params['subject'];
-      }
-      if (params['forwardSubject']) {
-        this.subject = params['forwardSubject'];
-      }
-      if (params['forwardBody']) {
-        this.body = '\n\n--- Forwarded message ---\n' + params['forwardBody'];
-      }
-    });
-  }
-
-  onSend(): void {
-    this.sending = true;
-    this.mailService.send({ to: this.to, subject: this.subject, body: this.body, html: this.isHtml }).subscribe({
-      next: () => {
-        this.success = true;
-        this.sending = false;
-        this.to = '';
-        this.subject = '';
-        this.body = '';
-        this.isHtml = false;
-        setTimeout(() => this.router.navigate(['/inbox']), 1500);
-      },
-      error: () => {
-        this.sending = false;
-      }
-    });
-  }
-}

frontend/src/app/components/contacts/contacts.component.html

@@ -1,102 +0,0 @@
-<div class="space-y-4">
-  <h2 class="text-lg font-orbitron font-bold text-cyan-300 flex items-center gap-2">
-    <i class="fa-solid fa-users text-pink-500"></i> CONTACTS
-    <span class="text-sm font-mono text-slate-400 ml-auto">{{ contacts().length }} contacts</span>
-  </h2>
-
-  <!-- Форма добавления -->
-  <div class="glass-panel p-5">
-    <h3 class="text-sm font-orbitron font-bold text-yellow-400 mb-3 flex items-center gap-2">
-      <i class="fa-solid fa-pen-to-square text-pink-500"></i> {{ editingContact() ? 'EDIT CONTACT' : 'ADD NEW CONTACT' }}
-    </h3>
-    <form (ngSubmit)="saveContact()" class="grid grid-cols-1 md:grid-cols-2 gap-3">
-      <div>
-        <label class="block text-xs font-mono text-pink-400 mb-1">NAME</label>
-        <input type="text" [(ngModel)]="formName" name="name"
-          class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-2.5 text-sm font-mono text-slate-200 focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-          placeholder="John Doe">
-      </div>
-      <div>
-        <label class="block text-xs font-mono text-pink-400 mb-1">EMAIL *</label>
-        <input type="email" [(ngModel)]="formEmail" name="email" required
-          class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-2.5 text-sm font-mono text-slate-200 focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-          placeholder="john@example.com">
-      </div>
-      <div>
-        <label class="block text-xs font-mono text-pink-400 mb-1">PHONE</label>
-        <input type="text" [(ngModel)]="formPhone" name="phone"
-          class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-2.5 text-sm font-mono text-slate-200 focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-          placeholder="+1 234 567 8900">
-      </div>
-      <div>
-        <label class="block text-xs font-mono text-pink-400 mb-1">COMPANY</label>
-        <input type="text" [(ngModel)]="formCompany" name="company"
-          class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-2.5 text-sm font-mono text-slate-200 focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-          placeholder="Acme Corp">
-      </div>
-      <div class="md:col-span-2 flex gap-2">
-        <button type="submit"
-          class="cyber-btn px-6 py-2 rounded-xl text-xs font-bold">
-          @if (editingContact()) {
-            <i class="fa-solid fa-save mr-1"></i> UPDATE
-          } @else {
-            <i class="fa-solid fa-plus mr-1"></i> ADD
-          }
-        </button>
-        @if (editingContact()) {
-          <button type="button" (click)="cancelEdit()"
-            class="px-4 py-2 rounded-xl text-xs font-mono text-slate-400 border border-slate-600/40 hover:text-slate-200 hover:border-slate-400 transition-all">
-            <i class="fa-solid fa-xmark mr-1"></i> CANCEL
-          </button>
-        }
-      </div>
-    </form>
-  </div>
-
-  <!-- Список контактов -->
-  <div class="glass-panel p-5">
-    @if (contacts().length === 0) {
-      <div class="text-center py-12 text-slate-400 font-mono">
-        <i class="fa-solid fa-address-card text-4xl mb-4 text-slate-600"></i>
-        <p>No contacts yet</p>
-      </div>
-    } @else {
-      <div class="space-y-2">
-        @for (contact of contacts(); track contact.id) {
-          <div class="flex items-center gap-3 p-3 rounded-xl border border-cyan-500/10 hover:border-cyan-500/40 hover:bg-cyan-500/5 transition-all">
-            <div class="w-10 h-10 rounded-full bg-purple-500/30 flex items-center justify-center text-cyan-400 font-bold text-lg">
-              {{ (contact.name || contact.email).charAt(0).toUpperCase() }}
-            </div>
-            <div class="flex-1 min-w-0">
-              <div class="font-mono text-slate-200 truncate">{{ contact.name || '(No name)' }}</div>
-              <div class="text-xs text-slate-400 font-mono truncate">{{ contact.email }}</div>
-              @if (contact.phone || contact.company) {
-                <div class="text-xs text-slate-500 font-mono">
-                  @if (contact.company) {
-                    {{ contact.company }}
-                  }
-                  @if (contact.company && contact.phone) {
-                    &nbsp;•&nbsp;
-                  }
-                  @if (contact.phone) {
-                    {{ contact.phone }}
-                  }
-                </div>
-              }
-            </div>
-            <div class="flex gap-1">
-              <button (click)="editContact(contact)"
-                class="px-2 py-1 text-xs font-mono text-cyan-400 hover:bg-cyan-500/10 rounded-lg transition-all">
-                <i class="fa-solid fa-pen"></i>
-              </button>
-              <button (click)="deleteContact(contact.id!)"
-                class="px-2 py-1 text-xs font-mono text-pink-400 hover:bg-pink-500/10 rounded-lg transition-all">
-                <i class="fa-solid fa-trash"></i>
-              </button>
-            </div>
-          </div>
-        }
-      </div>
-    }
-  </div>
-</div>

frontend/src/app/components/contacts/contacts.component.ts

@@ -1,94 +0,0 @@
-import { Component, inject, signal } from '@angular/core';
-import { FormsModule } from '@angular/forms';
-import { MailService } from '../../services/mail.service';
-import { Contact } from '../../models/mail.models';
-
-@Component({
-  selector: 'app-contacts',
-  standalone: true,
-  imports: [FormsModule],
-  providers: [MailService],
-  templateUrl: './contacts.component.html',
-  styles: ``
-})
-export default class ContactsComponent {
-  private mailService = inject(MailService);
-
-  contacts = signal<Contact[]>([]);
-  editingContact = signal<Contact | null>(null);
-
-  formName = '';
-  formEmail = '';
-  formPhone = '';
-  formCompany = '';
-
-  constructor() {
-    this.loadContacts();
-  }
-
-  loadContacts(): void {
-    this.mailService.getContacts().subscribe({
-      next: (contacts) => this.contacts.set(contacts),
-      error: (e) => console.error('Failed to load contacts', e)
-    });
-  }
-
-  saveContact(): void {
-    if (!this.formEmail.trim()) return;
-
-    const contact: Contact = {
-      name: this.formName.trim(),
-      email: this.formEmail.trim(),
-      phone: this.formPhone.trim() || undefined,
-      company: this.formCompany.trim() || undefined
-    };
-
-    if (this.editingContact()?.id) {
-      this.mailService.updateContact(this.editingContact()!.id!, contact).subscribe({
-        next: () => {
-          this.resetForm();
-          this.loadContacts();
-        },
-        error: (e) => console.error('Failed to update contact', e)
-      });
-    } else {
-      this.mailService.addContact(contact).subscribe({
-        next: () => {
-          this.resetForm();
-          this.loadContacts();
-        },
-        error: (e) => console.error('Failed to add contact', e)
-      });
-    }
-  }
-
-  editContact(contact: Contact): void {
-    this.editingContact.set(contact);
-    this.formName = contact.name || '';
-    this.formEmail = contact.email || '';
-    this.formPhone = contact.phone || '';
-    this.formCompany = contact.company || '';
-  }
-
-  cancelEdit(): void {
-    this.editingContact.set(null);
-    this.resetForm();
-  }
-
-  deleteContact(id: number): void {
-    if (confirm('Delete this contact?')) {
-      this.mailService.deleteContact(id).subscribe({
-        next: () => this.loadContacts(),
-        error: (e) => console.error('Failed to delete contact', e)
-      });
-    }
-  }
-
-  resetForm(): void {
-    this.formName = '';
-    this.formEmail = '';
-    this.formPhone = '';
-    this.formCompany = '';
-    this.editingContact.set(null);
-  }
-}

frontend/src/app/components/inbox/inbox.component.ts

@@ -1,196 +0,0 @@
-import { Component, inject, signal } from '@angular/core';
-import { RouterLink, ActivatedRoute } from '@angular/router';
-import { FormsModule } from '@angular/forms';
-import { MailService } from '../../services/mail.service';
-import { Message, Folder } from '../../models/mail.models';
-import { DatePipe, SlicePipe } from '@angular/common';
-import { map, switchMap } from 'rxjs/operators';
-import { of } from 'rxjs';
-
-@Component({
-  selector: 'app-inbox',
-  standalone: true,
-  imports: [RouterLink, FormsModule, DatePipe, SlicePipe],
-  providers: [MailService],
-  template: `
-    <div class="space-y-4">
-      <!-- Поиск -->
-      <div class="glass-panel p-4">
-        <div class="flex gap-3">
-          <input [(ngModel)]="searchQuery" (keyup.enter)="loadMessages()"
-            class="flex-1 bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-2 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-            placeholder="Search messages...">
-          <button (click)="loadMessages()" class="cyber-btn px-6 py-2 rounded-xl text-xs font-bold">
-            <i class="fa-solid fa-magnifying-glass mr-1"></i> SEARCH
-          </button>
-        </div>
-      </div>
-
-      <!-- Список писем -->
-      <div class="glass-panel p-4">
-        <h2 class="text-lg font-orbitron font-bold text-cyan-300 mb-4 flex items-center gap-2">
-          <i class="fa-solid fa-inbox text-pink-500"></i> {{ folderName() }}
-          <span class="text-sm font-mono text-slate-400 ml-auto">{{ messages()?.length || 0 }} messages</span>
-        </h2>
-
-        @if (!messages() || messages().length === 0) {
-          <div class="text-center py-12 text-slate-400 font-mono">
-            <i class="fa-solid fa-envelope-open-text text-4xl mb-4 text-slate-600"></i>
-            <p>No messages yet</p>
-          </div>
-        } @else {
-          <div class="space-y-2">
-            @for (msg of messages() || []; track msg.id) {
-              <a routerLink="/message/{{ msg.id }}"
-                 class="block p-4 rounded-xl border border-cyan-500/10 hover:border-cyan-500/40 hover:bg-cyan-500/5 transition-all cursor-pointer group">
-                <div class="flex items-start gap-3">
-                  <!-- Индикатор прочитанности -->
-                  <div class="mt-1">
-                    @if (!msg.read) {
-                      <span class="w-3 h-3 rounded-full bg-pink-500 inline-block shadow-[0_0_8px_rgba(255,0,127,0.8)]"></span>
-                    } @else {
-                      <span class="w-3 h-3 rounded-full border border-slate-500 inline-block"></span>
-                    }
-                  </div>
-
-                  <div class="flex-1 min-w-0">
-                    <div class="flex items-center gap-2 mb-1">
-                      <span class="font-bold text-sm text-slate-200 font-rajdhani truncate">
-                        {{ msg.senderName || msg.sender }}
-                      </span>
-                      @if (msg.spam) {
-                        <span class="px-2 py-0.5 text-xs rounded-full bg-yellow-500/20 text-yellow-400 font-mono">
-                          SPAM
-                        </span>
-                      }
-                      @if (msg.flagged) {
-                        <i class="fa-solid fa-star text-yellow-400 text-xs"></i>
-                      }
-                    </div>
-                    <div class="text-sm text-cyan-400 font-rajdhani truncate group-hover:text-pink-400 transition-colors">
-                      {{ msg.subject || '(No subject)' }}
-                    </div>
-                    <div class="text-xs text-slate-400 font-mono truncate">
-                      {{ msg.body || '' | slice:0:100 }}{{ (msg.body || '').length > 100 ? '...' : '' }}
-                    </div>
-                  </div>
-
-                  <div class="text-right flex-shrink-0">
-                    <div class="text-xs text-slate-400 font-mono">
-                      {{ msg.sentAt | date:'MMM d, HH:mm' }}
-                    </div>
-                    @if (msg.hasAttachments) {
-                      <span class="text-xs text-purple-400 font-mono"><i class="fa-solid fa-paperclip mr-1"></i>{{ msg.attachmentCount }}</span>
-                    }
-                  </div>
-                </div>
-              </a>
-            }
-          </div>
-        }
-      </div>
-
-      <!-- Пагинация -->
-      @if (totalPages() > 1) {
-        <div class="glass-panel p-4 flex items-center justify-center gap-2">
-          <button (click)="goToPage(page() - 1)" [disabled]="page() === 0"
-            class="px-3 py-1 rounded-lg text-xs font-mono text-cyan-400 border border-cyan-500/30 hover:bg-cyan-500/10 disabled:opacity-30 disabled:cursor-not-allowed transition-all">
-            <i class="fa-solid fa-chevron-left mr-1"></i> Prev
-          </button>
-          @for (p of pageNumbers; track p) {
-            <button (click)="goToPage(p)"
-              [class.bg-pink-500/20]="p === page()" [class.text-pink-400]="p === page()"
-              [class.border-pink-500]="p === page()"
-              class="px-3 py-1 rounded-lg text-xs font-mono text-slate-400 border border-cyan-500/20 hover:bg-cyan-500/10 hover:text-cyan-300 transition-all">
-              {{ p + 1 }}
-            </button>
-          }
-          <button (click)="goToPage(page() + 1)" [disabled]="page() >= totalPages() - 1"
-            class="px-3 py-1 rounded-lg text-xs font-mono text-cyan-400 border border-cyan-500/30 hover:bg-cyan-500/10 disabled:opacity-30 disabled:cursor-not-allowed transition-all">
-            Next <i class="fa-solid fa-chevron-right ml-1"></i>
-          </button>
-          <span class="text-xs font-mono text-slate-500 ml-2">
-            Page {{ page() + 1 }} of {{ totalPages() }}
-          </span>
-        </div>
-      }
-    </div>
-  `,
-  styles: ``
-})
-export default class InboxComponent {
-  private route = inject(ActivatedRoute);
-  private mailService = inject(MailService);
-  messages = signal<Message[]>([]);
-  folderName = signal<string>('INBOX');
-  searchQuery = '';
-  folderId = signal<number>(1);
-  page = signal<number>(0);
-  totalPages = signal<number>(1);
-  pageSize = 20;
-
-  constructor() {
-    // Подписываемся на изменения folderId в queryParams
-    this.route.queryParams.subscribe(params => {
-      const newFolderId = params['folderId'] ? Number(params['folderId']) : 1;
-      if (newFolderId !== this.folderId()) {
-        this.folderId.set(newFolderId);
-        this.loadFolderName(newFolderId);
-        this.loadMessages();
-      }
-    });
-    // Начальная загрузка
-    const initialFolderId = this.route.snapshot.queryParams['folderId'] ? Number(this.route.snapshot.queryParams['folderId']) : 1;
-    this.folderId.set(initialFolderId);
-    this.loadFolderName(initialFolderId);
-    this.loadMessages();
-  }
-
-  loadFolderName(folderId: number): void {
-    this.mailService.getFolders().subscribe({
-      next: (folders) => {
-        const folder = folders.find(f => f.id === folderId);
-        this.folderName.set(folder ? folder.name : 'INBOX');
-      },
-      error: () => this.folderName.set('INBOX')
-    });
-  }
-
-  loadMessages(): void {
-    const currentFolderId = this.folderId();
-    const currentPage = this.page();
-    if (this.searchQuery.trim()) {
-      this.mailService.searchMessages(currentFolderId, this.searchQuery.trim()).subscribe({
-        next: (msgs) => this.messages.set(msgs),
-        error: () => console.error('Search failed')
-      });
-    } else {
-      this.mailService.getMessages(currentFolderId, currentPage, this.pageSize).subscribe({
-        next: (result) => {
-          this.messages.set(result.content);
-          this.totalPages.set(result.totalPages);
-        },
-        error: () => console.error('Failed to load messages')
-      });
-    }
-  }
-
-  goToPage(page: number): void {
-    if (page >= 0 && page < this.totalPages()) {
-      this.page.set(page);
-      this.loadMessages();
-    }
-  }
-
-  get pageNumbers(): number[] {
-    const pages: number[] = [];
-    const total = this.totalPages();
-    const current = this.page();
-    const start = Math.max(0, current - 2);
-    const end = Math.min(total - 1, current + 2);
-    for (let i = start; i <= end; i++) {
-      pages.push(i);
-    }
-    return pages;
-  }
-}

frontend/src/app/components/layout/layout.component.ts

@@ -1,235 +0,0 @@
-import { Component, inject, signal, effect } from '@angular/core';
-import { RouterOutlet, RouterLink, RouterLinkActive } from '@angular/router';
-import { AuthService } from '../../services/auth.service';
-import { MailService } from '../../services/mail.service';
-import { Folder } from '../../models/mail.models';
-
-const THEMES = [
-  { value: 'theme-cyber-magenta', label: '💖 Cyber Magenta' },
-  { value: 'theme-neon-cyan', label: '🩵 Neon Cyan' },
-  { value: 'theme-sunset-orange', label: '🧡 Sunset Orange' },
-  { value: 'theme-matrix-green', label: '💚 Matrix Green' },
-];
-
-@Component({
-  selector: 'app-layout',
-  standalone: true,
-  imports: [RouterOutlet, RouterLink, RouterLinkActive],
-  template: `
-    <div #root class="min-h-screen relative theme-cyber-magenta" [class.light-theme]="isLightTheme()" [class.high-contrast]="isHighContrast()">
-      <!-- Synthwave анимированный фон -->
-      <div class="synth-stage" aria-hidden="true">
-        <div class="synth-sun"></div>
-        <div class="synth-mountains"></div>
-        <div class="grid-container">
-          <div class="grid-plane"></div>
-        </div>
-      </div>
-
-      <!-- Контент -->
-      <div class="relative z-10 flex flex-col min-h-screen">
-        <!-- Шапка -->
-        <header class="p-4 lg:p-6 border-b border-cyan-500/20 glass-panel rounded-none border-t-0 border-x-0 sticky top-0 z-40 backdrop-blur-xl">
-          <div class="max-w-7xl mx-auto flex flex-col md:flex-row items-center justify-between gap-4">
-
-            <!-- Логотип -->
-            <div class="flex items-center space-x-3">
-              <div class="w-10 h-10 rounded-lg bg-gradient-to-br from-pink-500 to-cyan-400 flex items-center justify-center text-slate-950 font-black text-xl shadow-[0_0_15px_rgba(255,0,127,0.8)] font-orbitron">
-                M
-              </div>
-              <div>
-                <h1 class="text-2xl font-extrabold font-orbitron tracking-wider neon-text-primary">
-                  MAIL<span class="text-cyan-400 font-normal">SERVER</span>
-                </h1>
-                <p class="text-xs text-cyan-300/70 font-mono tracking-widest uppercase">Synthwave Edition</p>
-              </div>
-            </div>
-
-            <!-- Статистика -->
-            <div class="flex items-center space-x-4 bg-slate-950/60 px-4 py-2 rounded-full border border-pink-500/30 text-xs font-mono">
-              <div class="flex items-center space-x-2">
-                <span class="w-2 h-2 rounded-full bg-emerald-400 animate-ping"></span>
-                <span class="text-slate-300">SMTP: <span class="text-emerald-400 font-bold">ONLINE</span></span>
-              </div>
-              <span class="text-slate-600">|</span>
-              <div class="text-slate-300">User: <span class="text-cyan-400 font-bold">{{ email }}</span></div>
-              <span class="text-slate-600">|</span>
-              <div class="text-slate-300">Folders: <span class="text-pink-400 font-bold">{{ folders().length }}</span></div>
-            </div>
-
-            <!-- Контроли -->
-            <div class="flex items-center space-x-3">
-              <!-- Выбор цветовой темы -->
-              <div class="relative">
-                <select #themeSelect (change)="onThemeChange(themeSelect.value)"
-                        class="bg-slate-900/90 text-cyan-300 border border-cyan-500/40 rounded-lg px-3 py-1.5 text-sm font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 cursor-pointer">
-                  @for (theme of themes; track theme.value) {
-                    <option [value]="theme.value" [selected]="currentTheme() === theme.value">
-                      {{ theme.label }}
-                    </option>
-                  }
-                </select>
-              </div>
-
-              <!-- High Contrast -->
-              <button (click)="toggleHighContrast()"
-                      [attr.aria-pressed]="isHighContrast()"
-                      title="Toggle High Contrast Mode"
-                      class="px-3 py-1.5 rounded-lg border border-cyan-500/40 bg-slate-900/80 text-xs font-mono hover:bg-cyan-500/20 focus:outline-none focus:ring-2 focus:ring-pink-500 transition-all flex items-center gap-1.5">
-                <i class="fa-solid fa-circle-half-stroke text-yellow-400"></i>
-                <span>Contrast</span>
-              </button>
-
-              <!-- Light/Dark -->
-              <button (click)="toggleTheme()" class="cyber-btn px-3 py-1.5 rounded-lg text-xs font-bold">
-                {{ isLightTheme() ? '🌙 Dark' : '☀️ Light' }}
-              </button>
-
-              <!-- Logout -->
-              <button (click)="onLogout()" class="cyber-btn px-4 py-1.5 rounded-lg text-xs font-bold">
-                <i class="fa-solid fa-power-off mr-1"></i> Logout
-              </button>
-            </div>
-          </div>
-        </header>
-
-        <!-- Основная область -->
-        <div class="flex flex-1 max-w-7xl mx-auto w-full p-4 gap-4">
-          <!-- Боковая панель -->
-          <aside class="w-64 flex-shrink-0">
-            <div class="glass-panel p-4">
-              <h2 class="text-sm font-orbitron font-bold text-cyan-300 mb-3 flex items-center gap-2">
-                <i class="fa-solid fa-folder-tree text-pink-500"></i> FOLDERS
-              </h2>
-              <nav class="space-y-1">
-                @for (folder of folders(); track folder.id) {
-                  <a routerLink="/inbox" [queryParams]="{folderId: folder.id}"
-                     routerLinkActive="bg-pink-500/20 text-pink-400 border-pink-500"
-                     [queryParamsHandling]="'merge'"
-                     class="block px-3 py-2 rounded-lg text-sm font-rajdhani text-slate-300 hover:bg-cyan-500/10 hover:text-cyan-300 border border-transparent transition-all">
-                    {{ folder.name }}
-                    @if (folder.unreadCount > 0) {
-                      <span class="ml-2 px-2 py-0.5 text-xs rounded-full bg-pink-500/30 text-pink-400 font-mono">
-                        {{ folder.unreadCount }}
-                      </span>
-                    }
-                  </a>
-                }
-              </nav>
-            </div>
-
-            <!-- Контакты -->
-            <div class="glass-panel p-4 mt-4">
-              <a routerLink="/contacts"
-                 routerLinkActive="bg-cyan-500/20 text-cyan-300 border-cyan-500"
-                 class="block px-3 py-2 rounded-lg text-sm font-rajdhani text-slate-300 hover:bg-cyan-500/10 hover:text-cyan-300 border border-transparent transition-all">
-                <i class="fa-solid fa-address-book mr-2"></i> Contacts
-              </a>
-            </div>
-
-            <!-- Кнопка написать -->
-            <div class="glass-panel p-4 mt-4">
-              <a routerLink="/compose" class="cyber-btn w-full py-3 rounded-xl text-xs font-bold block text-center">
-                <i class="fa-solid fa-pen-to-square mr-2"></i> NEW MESSAGE
-              </a>
-            </div>
-          </aside>
-
-          <!-- Контент маршрутов -->
-          <main class="flex-1 min-w-0">
-            <router-outlet />
-          </main>
-        </div>
-
-        <!-- Футер -->
-        <footer class="p-4 border-t border-cyan-500/20 glass-panel rounded-none border-b-0 border-x-0 mt-6 text-center text-xs font-mono text-slate-400">
-          <div class="max-w-7xl mx-auto flex flex-col sm:flex-row items-center justify-between gap-2">
-            <div>MAILSERVER SYNTHWAVE &copy; 2026</div>
-            <div class="flex items-center space-x-4">
-              <span class="text-cyan-400"><i class="fa-solid fa-universal-access mr-1"></i> A11Y READY</span>
-              <span class="text-pink-400"><i class="fa-solid fa-bolt mr-1"></i> HIGH PERF CSS3D</span>
-            </div>
-          </div>
-        </footer>
-      </div>
-    </div>
-  `,
-  styles: ``
-})
-export default class LayoutComponent {
-  authService = inject(AuthService);
-  mailService = inject(MailService);
-
-  email = this.authService.getEmail() || '';
-  folders = signal<Folder[]>([]);
-  isLightTheme = signal(false);
-  isHighContrast = signal(false);
-  currentTheme = signal('theme-cyber-magenta');
-  themes = THEMES;
-
-  constructor() {
-    this.loadFolders();
-    // Загружаем сохранённые настройки
-    const savedTheme = localStorage.getItem('theme');
-    if (savedTheme === 'light') {
-      this.isLightTheme.set(true);
-    }
-    const savedPalette = localStorage.getItem('palette');
-    if (savedPalette) {
-      this.currentTheme.set(savedPalette);
-    }
-    const savedContrast = localStorage.getItem('highContrast');
-    if (savedContrast === 'true') {
-      this.isHighContrast.set(true);
-    }
-
-    // Применяем тему при изменении
-    effect(() => {
-      const root = document.documentElement;
-      // Удаляем все theme классы
-      THEMES.forEach(t => root.classList.remove(t.value));
-      root.classList.add(this.currentTheme());
-    });
-  }
-
-  onThemeChange(theme: string): void {
-    this.currentTheme.set(theme);
-    localStorage.setItem('palette', theme);
-  }
-
-  toggleTheme(): void {
-    const isLight = !this.isLightTheme();
-    this.isLightTheme.set(isLight);
-    if (isLight) {
-      document.documentElement.classList.add('light-theme');
-      localStorage.setItem('theme', 'light');
-    } else {
-      document.documentElement.classList.remove('light-theme');
-      localStorage.setItem('theme', 'dark');
-    }
-  }
-
-  toggleHighContrast(): void {
-    const hc = !this.isHighContrast();
-    this.isHighContrast.set(hc);
-    if (hc) {
-      document.documentElement.classList.add('high-contrast');
-      localStorage.setItem('highContrast', 'true');
-    } else {
-      document.documentElement.classList.remove('high-contrast');
-      localStorage.setItem('highContrast', 'false');
-    }
-  }
-
-  loadFolders(): void {
-    this.mailService.getFolders().subscribe({
-      next: (folders) => this.folders.set(folders),
-      error: () => console.error('Failed to load folders')
-    });
-  }
-
-  onLogout(): void {
-    this.authService.logout();
-    window.location.href = '/login';
-  }
-}

frontend/src/app/components/login/login.component.ts

@@ -1,98 +0,0 @@
-import { Component, inject } from '@angular/core';
-import { RouterLink } from '@angular/router';
-import { FormsModule } from '@angular/forms';
-import { AuthService } from '../../services/auth.service';
-import { Router } from '@angular/router';
-
-@Component({
-  selector: 'app-login',
-  standalone: true,
-  imports: [RouterLink, FormsModule],
-  template: `
-    <div class="min-h-screen relative flex items-center justify-center theme-cyber-magenta">
-      <!-- Synthwave анимированный фон -->
-      <div class="synth-stage" aria-hidden="true">
-        <div class="synth-sun"></div>
-        <div class="synth-mountains"></div>
-        <div class="grid-container">
-          <div class="grid-plane"></div>
-        </div>
-      </div>
-
-      <!-- Форма логина -->
-      <div class="relative z-10 w-full max-w-md px-4">
-        <div class="glass-panel p-8 border-2 border-cyan-400 shadow-[0_0_50px_rgba(0,240,255,0.4)]">
-          <div class="text-center mb-8">
-            <div class="w-16 h-16 mx-auto rounded-xl bg-gradient-to-br from-pink-500 to-cyan-400 flex items-center justify-center text-slate-950 font-black text-2xl font-orbitron shadow-[0_0_20px_rgba(255,0,127,0.8)] mb-4">
-              M
-            </div>
-            <h1 class="text-3xl font-extrabold font-orbitron tracking-wider neon-text-primary mb-2">
-              MAIL<span class="text-cyan-400 font-normal">SERVER</span>
-            </h1>
-            <p class="text-sm text-cyan-300/70 font-mono tracking-widest uppercase">Synthwave Edition</p>
-          </div>
-
-          @if (error) {
-            <div class="mb-4 p-3 rounded-lg bg-pink-500/20 border border-pink-500/40 text-pink-400 text-sm font-mono">
-              {{ error }}
-            </div>
-          }
-
-          <form (ngSubmit)="onLogin()" class="space-y-4">
-            <div>
-              <label for="email" class="block text-xs font-mono text-pink-400 mb-1">EMAIL</label>
-              <input id="email" type="email" [(ngModel)]="email" name="email" required
-                class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-                placeholder="user@example.com">
-            </div>
-
-            <div>
-              <label for="password" class="block text-xs font-mono text-pink-400 mb-1">PASSWORD</label>
-              <input id="password" type="password" [(ngModel)]="password" name="password" required
-                class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-                placeholder="••••••••">
-            </div>
-
-            <button type="submit" [disabled]="loading"
-              class="cyber-btn w-full py-3 rounded-xl text-sm font-bold mt-6">
-              @if (loading) {
-                <i class="fa-solid fa-spinner fa-spin mr-1"></i> CONNECTING...
-              } @else {
-                <i class="fa-solid fa-bolt mr-1"></i> LOGIN
-              }
-            </button>
-          </form>
-
-          <p class="text-center text-sm text-slate-400 mt-6 font-rajdhani">
-            No account? 
-            <a routerLink="/register" class="text-cyan-400 hover:text-pink-400 font-mono transition-colors">
-              Register here
-            </a>
-          </p>
-        </div>
-      </div>
-    </div>
-  `,
-  styles: ``
-})
-export default class LoginComponent {
-  private authService = inject(AuthService);
-  private router = inject(Router);
-
-  email = '';
-  password = '';
-  error = '' as string | null;
-  loading = false as boolean;
-
-  onLogin(): void {
-    this.loading = true;
-    this.error = null;
-    this.authService.login({ email: this.email, password: this.password }).subscribe({
-      next: () => this.router.navigate(['/inbox']),
-      error: (err) => {
-        this.error = 'Invalid email or password';
-        this.loading = false;
-      }
-    });
-  }
-}

frontend/src/app/components/message-detail/message-detail.component.ts

@@ -1,120 +0,0 @@
-import { Component, inject } from '@angular/core';
-import { RouterLink } from '@angular/router';
-import { MailService } from '../../services/mail.service';
-import { ActivatedRoute } from '@angular/router';
-import { DatePipe } from '@angular/common';
-import { Message } from '../../models/mail.models';
-
-@Component({
-  selector: 'app-message-detail',
-  standalone: true,
-  imports: [RouterLink, DatePipe],
-  template: `
-    @if (message) {
-      <div class="glass-panel p-6">
-        <!-- Заголовок письма -->
-        <div class="mb-6 pb-4 border-b border-cyan-500/20">
-          <h1 class="text-xl font-orbitron font-bold neon-text-secondary mb-3">
-            {{ message.subject || '(No subject)' }}
-          </h1>
-
-          <div class="flex items-center gap-4 text-sm font-mono">
-            <div class="flex items-center gap-2">
-              <span class="text-cyan-500">FROM:</span>
-              <span class="text-slate-200">{{ message.senderName || message.sender }}</span>
-            </div>
-            <div class="flex items-center gap-2">
-              <span class="text-cyan-500">DATE:</span>
-              <span class="text-slate-200">{{ message.sentAt | date:'MMM d, y, HH:mm' }}</span>
-            </div>
-          </div>
-
-          @if (message.spam) {
-            <div class="mt-3 px-3 py-1.5 inline-block rounded-full bg-yellow-500/20 border border-yellow-500/40 text-yellow-500 text-xs font-mono">
-              <i class="fa-solid fa-triangle-exclamation mr-1"></i> MARKED AS SPAM
-            </div>
-          }
-        </div>
-
-        <!-- Тело письма -->
-        <div class="prose prose-invert max-w-none mb-6">
-          <p class="text-slate-300 font-rajdhani text-lg whitespace-pre-wrap leading-relaxed">
-            {{ message.body }}
-          </p>
-        </div>
-
-        <!-- Вложения -->
-        @if (message.hasAttachments) {
-          <div class="mb-6 p-4 rounded-xl bg-slate-950/60 border border-purple-500/30">
-            <h3 class="text-sm font-orbitron font-bold text-purple-500 mb-3">
-              <i class="fa-solid fa-paperclip mr-1"></i> ATTACHMENTS ({{ message.attachmentCount }})
-            </h3>
-            <p class="text-xs text-slate-400 font-mono">
-              Attachments are available via the API
-            </p>
-          </div>
-        }
-
-        <!-- Действия -->
-        <div class="flex gap-3 pt-4 border-t border-cyan-500/20">
-          <a routerLink="/inbox" class="cyber-btn px-6 py-2 rounded-xl text-xs font-bold">
-            <i class="fa-solid fa-chevron-left mr-1"></i> BACK TO INBOX
-          </a>
-          <a [routerLink]="['/compose']" [queryParams]="{replyTo: message.sender, subject: 'Re: ' + (message.subject || '')}"
-            class="px-6 py-2 rounded-xl text-xs font-mono text-cyan-500 border border-cyan-500/40 hover:bg-cyan-500/20 transition-all">
-            <i class="fa-solid fa-reply mr-1"></i> REPLY
-          </a>
-          <a [routerLink]="['/compose']" [queryParams]="{forwardTo: '', forwardSubject: 'Fwd: ' + (message.subject || ''), forwardBody: message.body}"
-            class="px-6 py-2 rounded-xl text-xs font-mono text-purple-500 border border-purple-500/40 hover:bg-purple-500/20 transition-all">
-            <i class="fa-solid fa-share mr-1"></i> FORWARD
-          </a>
-          <button (click)="onDelete()" class="px-6 py-2 rounded-xl text-xs font-mono text-pink-500 border border-pink-500/40 hover:bg-pink-500/20 transition-all">
-            <i class="fa-solid fa-trash mr-1"></i> DELETE
-          </button>
-        </div>
-      </div>
-    } @else {
-      <div class="glass-panel p-6 text-center py-12">
-        <i class="fa-solid fa-envelope-open-text text-4xl mb-4 text-slate-600"></i>
-        <p class="text-slate-400 font-mono">Message not found</p>
-        <a routerLink="/inbox" class="cyber-btn px-6 py-2 rounded-xl text-xs font-bold mt-4 inline-block">
-          ← BACK TO INBOX
-        </a>
-      </div>
-    }
-  `,
-  styles: ``
-})
-export default class MessageDetailComponent {
-  private mailService = inject(MailService);
-  private route = inject(ActivatedRoute);
-  
-  message: Message | null = null;
-  messageId = 0;
-
-  constructor() {
-    this.messageId = Number(this.route.snapshot.paramMap.get('id'));
-    this.loadMessage();
-  }
-
-  loadMessage(): void {
-    this.mailService.getMessage(this.messageId).subscribe({
-      next: (msg) => {
-        this.message = msg;
-        if (!msg.read) {
-          this.mailService.markAsRead(this.messageId).subscribe();
-        }
-      },
-      error: () => console.error('Failed to load message')
-    });
-  }
-
-  onDelete(): void {
-    if (confirm('Delete this message?')) {
-      this.mailService.deleteMessage(this.messageId).subscribe({
-        next: () => (window.location.href = '/inbox'),
-        error: () => console.error('Failed to delete message')
-      });
-    }
-  }
-}

frontend/src/app/components/register/register.component.ts

@@ -1,121 +0,0 @@
-import { Component, inject } from '@angular/core';
-import { RouterLink } from '@angular/router';
-import { FormsModule } from '@angular/forms';
-import { AuthService } from '../../services/auth.service';
-import { Router } from '@angular/router';
-
-@Component({
-  selector: 'app-register',
-  standalone: true,
-  imports: [RouterLink, FormsModule],
-  template: `
-    <div class="min-h-screen relative flex items-center justify-center theme-cyber-magenta">
-      <!-- Synthwave анимированный фон -->
-      <div class="synth-stage" aria-hidden="true">
-        <div class="synth-sun"></div>
-        <div class="synth-mountains"></div>
-        <div class="grid-container">
-          <div class="grid-plane"></div>
-        </div>
-      </div>
-
-      <!-- Форма регистрации -->
-      <div class="relative z-10 w-full max-w-md px-4">
-        <div class="glass-panel p-8 border-2 border-cyan-400 shadow-[0_0_50px_rgba(0,240,255,0.4)]">
-          <div class="text-center mb-8">
-            <div class="w-16 h-16 mx-auto rounded-xl bg-gradient-to-br from-pink-500 to-cyan-400 flex items-center justify-center text-slate-950 font-black text-2xl font-orbitron shadow-[0_0_20px_rgba(255,0,127,0.8)] mb-4">
-              M
-            </div>
-            <h1 class="text-3xl font-extrabold font-orbitron tracking-wider neon-text-primary mb-2">
-              MAIL<span class="text-cyan-400 font-normal">SERVER</span>
-            </h1>
-            <p class="text-sm text-cyan-300/70 font-mono tracking-widest uppercase">Create your mailbox</p>
-          </div>
-
-          @if (error) {
-            <div class="mb-4 p-3 rounded-lg bg-pink-500/20 border border-pink-500/40 text-pink-400 text-sm font-mono">
-              {{ error }}
-            </div>
-          }
-          @if (success) {
-            <div class="mb-4 p-3 rounded-lg bg-cyan-500/20 border border-cyan-500/40 text-cyan-400 text-sm font-mono">
-              Account created! Redirecting to login...
-            </div>
-          }
-
-          <form (ngSubmit)="onRegister()" class="space-y-4">
-            <div>
-              <label for="displayName" class="block text-xs font-mono text-pink-400 mb-1">DISPLAY NAME</label>
-              <input id="displayName" type="text" [(ngModel)]="displayName" name="displayName" required
-                class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-                placeholder="John Doe">
-            </div>
-
-            <div>
-              <label for="email" class="block text-xs font-mono text-pink-400 mb-1">EMAIL</label>
-              <input id="email" type="email" [(ngModel)]="email" name="email" required
-                class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-                placeholder="user@example.com">
-            </div>
-
-            <div>
-              <label for="password" class="block text-xs font-mono text-pink-400 mb-1">PASSWORD</label>
-              <input id="password" type="password" [(ngModel)]="password" name="password" required
-                class="w-full bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-3 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
-                placeholder="••••••••">
-            </div>
-
-            <button type="submit" [disabled]="loading"
-              class="cyber-btn w-full py-3 rounded-xl text-sm font-bold mt-6">
-              @if (loading) {
-                <i class="fa-solid fa-spinner fa-spin mr-1"></i> CREATING...
-              } @else {
-                <i class="fa-solid fa-bolt mr-1"></i> REGISTER
-              }
-            </button>
-          </form>
-
-          <p class="text-center text-sm text-slate-400 mt-6 font-rajdhani">
-            Already have an account? 
-            <a routerLink="/login" class="text-cyan-400 hover:text-pink-400 font-mono transition-colors">
-              Login here
-            </a>
-          </p>
-        </div>
-      </div>
-    </div>
-  `,
-  styles: ``
-})
-export default class RegisterComponent {
-  private authService = inject(AuthService);
-  private router = inject(Router);
-
-  displayName = '';
-  email = '';
-  password = '';
-  error = '' as string | null;
-  success = false as boolean;
-  loading = false as boolean;
-
-  onRegister(): void {
-    this.loading = true;
-    this.error = null;
-    this.success = false;
-    this.authService.register({ 
-      email: this.email, 
-      password: this.password, 
-      displayName: this.displayName 
-    }).subscribe({
-      next: () => {
-        this.success = true;
-        this.loading = false;
-        setTimeout(() => this.router.navigate(['/login']), 1500);
-      },
-      error: (err) => {
-        this.error = 'Registration failed. Email may already be taken.';
-        this.loading = false;
-      }
-    });
-  }
-}

frontend/src/app/core/api.service.ts

@@ -0,0 +1,92 @@
+import { Injectable, inject } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { Attachment, BlacklistEntry, Contact, Draft, Folder, Mailbox, MailboxCreated, Message, Profile, ServerConfig } from './models';
+
+/** The mail server REST API (same origin, /api). */
+@Injectable({ providedIn: 'root' })
+export class ApiService {
+  private http = inject(HttpClient);
+
+  config(): Observable<ServerConfig> { return this.http.get<ServerConfig>('/api/config'); }
+
+  // profile
+  me(): Observable<Profile> { return this.http.get<Profile>('/api/me'); }
+  updateMe(displayName: string): Observable<Profile> { return this.http.put<Profile>('/api/me', { displayName }); }
+  changePassword(currentPassword: string, newPassword: string): Observable<unknown> {
+    return this.http.put('/api/me/password', { currentPassword, newPassword });
+  }
+
+  // mailboxes — administrators only
+  mailboxes(): Observable<Mailbox[]> { return this.http.get<Mailbox[]>('/api/admin/mailboxes'); }
+  createMailbox(email: string, displayName: string, password: string): Observable<MailboxCreated> {
+    return this.http.post<MailboxCreated>('/api/admin/mailboxes', { email, displayName, password });
+  }
+  newMailboxPassword(id: number): Observable<MailboxCreated> {
+    return this.http.post<MailboxCreated>(`/api/admin/mailboxes/${id}/password`, {});
+  }
+  openMailbox(id: number): Observable<{ token: string; email: string }> {
+    return this.http.post<{ token: string; email: string }>(`/api/admin/mailboxes/${id}/open`, {});
+  }
+  setMailboxActive(id: number, active: boolean): Observable<Mailbox> {
+    return this.http.put<Mailbox>(`/api/admin/mailboxes/${id}/active`, { active });
+  }
+
+  // folders
+  folders(): Observable<Folder[]> { return this.http.get<Folder[]>('/api/folders'); }
+  createFolder(name: string): Observable<Folder> { return this.http.post<Folder>('/api/folders', { name }); }
+  renameFolder(id: number, name: string): Observable<unknown> { return this.http.put(`/api/folders/${id}`, { name }); }
+  deleteFolder(id: number): Observable<unknown> { return this.http.delete(`/api/folders/${id}`); }
+  emptyFolder(id: number): Observable<{ deleted: number }> {
+    return this.http.delete<{ deleted: number }>(`/api/folders/${id}/messages`);
+  }
+
+  // messages
+  messages(folderId: number): Observable<Message[]> {
+    return this.http.get<Message[]>('/api/messages', { params: { folderId } });
+  }
+  search(folderId: number, keyword: string): Observable<Message[]> {
+    return this.http.get<Message[]>('/api/messages/search', { params: { folderId, keyword } });
+  }
+  message(id: number): Observable<Message> { return this.http.get<Message>(`/api/messages/${id}`); }
+  updateMessage(id: number, change: { read?: boolean; flagged?: boolean; folderId?: number }): Observable<Message> {
+    return this.http.patch<Message>(`/api/messages/${id}`, change);
+  }
+  deleteMessage(id: number): Observable<unknown> { return this.http.delete(`/api/messages/${id}`); }
+
+  // compose
+  createDraft(draft: Draft): Observable<Message> { return this.http.post<Message>('/api/drafts', draft); }
+  updateDraft(id: number, draft: Draft): Observable<Message> { return this.http.put<Message>(`/api/drafts/${id}`, draft); }
+  send(draft: Draft, draftId: number | null): Observable<Message> {
+    return this.http.post<Message>('/api/send', { ...draft, draftId });
+  }
+
+  // attachments
+  attachments(messageId: number): Observable<Attachment[]> {
+    return this.http.get<Attachment[]>(`/api/messages/${messageId}/attachments`);
+  }
+  upload(messageId: number, file: File): Observable<Attachment> {
+    const form = new FormData();
+    form.append('file', file, file.name);
+    return this.http.post<Attachment>(`/api/messages/${messageId}/attachments`, form);
+  }
+  deleteAttachment(id: number): Observable<unknown> { return this.http.delete(`/api/attachments/${id}`); }
+  download(id: number): Observable<Blob> {
+    return this.http.get(`/api/attachments/${id}/download`, { responseType: 'blob' });
+  }
+
+  // contacts
+  contacts(): Observable<Contact[]> { return this.http.get<Contact[]>('/api/contacts'); }
+  addContact(contact: Contact): Observable<unknown> { return this.http.post('/api/contacts', contact); }
+  updateContact(id: number, contact: Contact): Observable<unknown> { return this.http.put(`/api/contacts/${id}`, contact); }
+  deleteContact(id: number): Observable<unknown> { return this.http.delete(`/api/contacts/${id}`); }
+
+  // blacklist
+  blacklist(): Observable<BlacklistEntry[]> { return this.http.get<BlacklistEntry[]>('/api/spam/blacklist'); }
+  block(senderEmail: string, reason: string): Observable<unknown> {
+    return this.http.post('/api/spam/blacklist', { senderEmail, reason });
+  }
+  unblock(senderEmail: string): Observable<unknown> {
+    return this.http.delete('/api/spam/blacklist', { params: { senderEmail } });
+  }
+}

frontend/src/app/core/auth.service.ts

@@ -0,0 +1,82 @@
+import { Injectable, computed, inject, signal } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Router } from '@angular/router';
+import { Observable, tap } from 'rxjs';
+
+interface TokenResponse { token: string; email: string; }
+
+/** JWT in localStorage; who is logged in. */
+@Injectable({ providedIn: 'root' })
+export class AuthService {
+  private http = inject(HttpClient);
+  private router = inject(Router);
+
+  readonly email = signal<string | null>(read('email'));
+  /** Administrator who opened this mailbox (Settings → MAILBOXES → Open), or null */
+  readonly openedBy = signal<string | null>(read('adminEmail'));
+  readonly loggedIn = computed(() => this.email() !== null && read('token') !== null);
+
+  login(email: string, password: string): Observable<TokenResponse> {
+    return this.http.post<TokenResponse>('/api/login', { email, password }).pipe(tap(r => this.store(r)));
+  }
+
+  register(email: string, password: string, displayName: string): Observable<TokenResponse> {
+    return this.http.post<TokenResponse>('/api/register', { email, password, displayName }).pipe(tap(r => this.store(r)));
+  }
+
+  token(): string | null { return read('token'); }
+
+  /** Administrator opens another mailbox: its session, the admin session kept to come back. */
+  openAs(response: TokenResponse): void {
+    const adminToken = read('token');
+    const adminEmail = read('email');
+    try {
+      if (adminToken && adminEmail && !read('adminToken')) {
+        localStorage.setItem('adminToken', adminToken);
+        localStorage.setItem('adminEmail', adminEmail);
+      }
+    } catch { /* storage blocked */ }
+    this.store(response);
+    this.openedBy.set(read('adminEmail'));
+  }
+
+  /** Back to the administrator's own mailbox. */
+  backToAdmin(): void {
+    const token = read('adminToken');
+    const email = read('adminEmail');
+    try {
+      localStorage.removeItem('adminToken');
+      localStorage.removeItem('adminEmail');
+    } catch { /* storage blocked */ }
+    this.openedBy.set(null);
+    if (token && email) { this.store({ token, email }); } else { this.clear(); }
+  }
+
+  logout(): void {
+    this.clear();
+    this.router.navigate(['/login']);
+  }
+
+  clear(): void {
+    try {
+      localStorage.removeItem('token');
+      localStorage.removeItem('email');
+      localStorage.removeItem('adminToken');
+      localStorage.removeItem('adminEmail');
+    } catch { /* storage blocked */ }
+    this.email.set(null);
+    this.openedBy.set(null);
+  }
+
+  private store(response: TokenResponse): void {
+    try {
+      localStorage.setItem('token', response.token);
+      localStorage.setItem('email', response.email);
+    } catch { /* storage blocked: logged in for this tab only */ }
+    this.email.set(response.email);
+  }
+}
+
+function read(key: string): string | null {
+  try { return localStorage.getItem(key); } catch { return null; }
+}

frontend/src/app/core/auth.ts

@@ -0,0 +1,28 @@
+import { HttpErrorResponse, HttpInterceptorFn } from '@angular/common/http';
+import { inject } from '@angular/core';
+import { CanActivateFn, Router } from '@angular/router';
+import { catchError, throwError } from 'rxjs';
+import { AuthService } from './auth.service';
+
+export const authInterceptor: HttpInterceptorFn = (req, next) => {
+  const auth = inject(AuthService);
+  const router = inject(Router);
+  const token = auth.token();
+  const request = token ? req.clone({ setHeaders: { Authorization: `Bearer ${token}` } }) : req;
+  return next(request).pipe(
+    catchError((error: unknown) => {
+      // not logged in or the token expired → to the login form
+      if (error instanceof HttpErrorResponse && error.status === 401 && !req.url.endsWith('/login')) {
+        auth.clear();
+        router.navigate(['/login']);
+      }
+      return throwError(() => error);
+    })
+  );
+};
+
+export const authGuard: CanActivateFn = () =>
+  inject(AuthService).loggedIn() ? true : inject(Router).createUrlTree(['/login']);
+
+export const guestGuard: CanActivateFn = () =>
+  inject(AuthService).loggedIn() ? inject(Router).createUrlTree(['/']) : true;

frontend/src/app/core/mail-state.service.ts

@@ -0,0 +1,35 @@
+import { Injectable, computed, inject, signal } from '@angular/core';
+import { ApiService } from './api.service';
+import { Folder, Profile } from './models';
+
+/** Folders and the profile, shared by the sidebar, the lists and the header; refreshed after changes. */
+@Injectable({ providedIn: 'root' })
+export class MailStateService {
+  private api = inject(ApiService);
+
+  readonly folders = signal<Folder[]>([]);
+  readonly profile = signal<Profile | null>(null);
+  readonly inbox = computed(() => this.folders().find(f => f.system && f.name === 'INBOX') ?? null);
+  readonly unreadTotal = computed(() => this.inbox()?.unreadCount ?? 0);
+
+  system(name: string): Folder | null {
+    return this.folders().find(f => f.system && f.name === name) ?? null;
+  }
+
+  folder(id: number): Folder | null {
+    return this.folders().find(f => f.id === id) ?? null;
+  }
+
+  refreshFolders(): void {
+    this.api.folders().subscribe({ next: folders => this.folders.set(folders), error: () => {} });
+  }
+
+  refreshProfile(): void {
+    this.api.me().subscribe({ next: profile => this.profile.set(profile), error: () => {} });
+  }
+
+  reset(): void {
+    this.folders.set([]);
+    this.profile.set(null);
+  }
+}

frontend/src/app/core/models.ts

@@ -0,0 +1,127 @@
+export interface Folder {
+  id: number;
+  name: string;
+  system: boolean;
+  messageCount: number;
+  unreadCount: number;
+}
+
+export interface Message {
+  id: number;
+  folderId: number;
+  senderEmail: string;
+  senderName?: string | null;
+  recipientEmail: string;
+  ccEmail?: string | null;
+  subject: string;
+  body: string;
+  html: boolean;
+  read: boolean;
+  flagged: boolean;
+  spam: boolean;
+  messageSize?: number | null;
+  receivedAt: string;
+  hasAttachments: boolean;
+  attachmentCount: number;
+}
+
+export interface Attachment {
+  id: number;
+  filename: string;
+  contentType: string;
+  sizeBytes: number;
+}
+
+export interface Contact {
+  id?: number;
+  name: string;
+  email: string;
+  phone?: string;
+  company?: string;
+}
+
+export interface BlacklistEntry {
+  id: number;
+  senderEmail: string;
+  reason?: string | null;
+  createdAt?: string;
+}
+
+export interface Profile {
+  email: string;
+  displayName: string;
+  usedBytes: number;
+  quotaBytes: number;
+  createdAt: string;
+  admin?: boolean;        // may manage mailboxes (Settings → Mailboxes)
+}
+
+/** MailboxAdminController.MailboxView */
+export interface Mailbox {
+  id: number;
+  email: string;
+  displayName: string;
+  active: boolean;
+  admin: boolean;
+  usedBytes: number;
+  quotaBytes: number;
+  createdAt: string;
+}
+
+/** password — generated by the server, shown once; null when the administrator chose it */
+export interface MailboxCreated {
+  mailbox: Mailbox;
+  password: string | null;
+}
+
+export interface ServerConfig {
+  registrationEnabled: boolean;
+  domains: string[];
+}
+
+export interface Draft {
+  to: string;
+  cc: string;
+  subject: string;
+  body: string;
+  html: boolean;
+}
+
+/** System folders: label and icon in the web client. */
+export const FOLDER_VIEW: Record<string, { label: string; icon: string }> = {
+  INBOX: { label: 'Inbox', icon: 'inbox' },
+  Drafts: { label: 'Drafts', icon: 'edit_note' },
+  Sent: { label: 'Sent', icon: 'send' },
+  Spam: { label: 'Spam', icon: 'report' },
+  Trash: { label: 'Trash', icon: 'delete' }
+};
+
+export function folderLabel(folder: Folder): string {
+  return folder.system ? (FOLDER_VIEW[folder.name]?.label ?? folder.name) : folder.name;
+}
+
+export function folderIcon(folder: Folder): string {
+  return folder.system ? (FOLDER_VIEW[folder.name]?.icon ?? 'folder') : 'folder';
+}
+
+export function formatBytes(bytes: number | null | undefined): string {
+  const value = bytes ?? 0;
+  if (value < 1024) return `${value} B`;
+  if (value < 1024 * 1024) return `${(value / 1024).toFixed(1)} KB`;
+  if (value < 1024 * 1024 * 1024) return `${(value / 1024 / 1024).toFixed(1)} MB`;
+  return `${(value / 1024 / 1024 / 1024).toFixed(2)} GB`;
+}
+
+/** Text of an API error: our {error}, Spring's {message}, or the status. */
+export function errorText(error: unknown): string {
+  const e = error as { error?: { error?: string; message?: string; status?: number } | string; status?: number; message?: string };
+  if (e?.error && typeof e.error === 'object') {
+    // Spring's error body: {status, error: "Bad Request", message: "No such mailbox: …"} — the reason is in message
+    const body = e.error;
+    const springBody = typeof body.status === 'number';
+    return (springBody ? body.message || body.error : body.error || body.message) || `Error ${e.status ?? ''}`.trim();
+  }
+  if (typeof e?.error === 'string' && e.error) return e.error;
+  if (e?.status === 0) return 'Server is not reachable';
+  return e?.message || 'Something went wrong';
+}

frontend/src/app/interceptors/auth.interceptor.ts

@@ -1,22 +0,0 @@
-import { HttpErrorResponse, HttpInterceptorFn, HttpRequest, HttpHandlerFn } from '@angular/common/http';
-import { inject } from '@angular/core';
-import { Router } from '@angular/router';
-import { catchError, throwError } from 'rxjs';
-
-export const authInterceptor: HttpInterceptorFn = (req: HttpRequest<unknown>, next: HttpHandlerFn) => {
-  const router = inject(Router);
-  const token = localStorage.getItem('token');
-  const request = token ? req.clone({ setHeaders: { Authorization: `Bearer ${token}` } }) : req;
-
-  return next(request).pipe(
-    catchError((error: unknown) => {
-      // not logged in or the token expired → to the login form
-      if (error instanceof HttpErrorResponse && error.status === 401 && !req.url.endsWith('/login')) {
-        localStorage.removeItem('token');
-        localStorage.removeItem('email');
-        router.navigate(['/login']);
-      }
-      return throwError(() => error);
-    })
-  );
-};

frontend/src/app/models/mail.models.ts

@@ -1,73 +0,0 @@
-export interface Message {
-  id: number;
-  subject: string;
-  body: string;
-  sender: string;
-  senderName?: string;
-  recipient: string;
-  sentAt: string;
-  read: boolean;
-  flagged: boolean;
-  spam: boolean;
-  folderId: number;
-  folderName: string;
-  hasAttachments: boolean;
-  attachmentCount: number;
-}
-
-export interface Folder {
-  id: number;
-  name: string;
-  unreadCount: number;
-}
-
-export interface Attachment {
-  id: number;
-  filename: string;
-  contentType: string;
-  sizeBytes: number;
-}
-
-export interface LoginRequest {
-  email: string;
-  password: string;
-}
-
-export interface LoginResponse {
-  token: string;
-  email: string;
-}
-
-export interface RegisterRequest {
-  email: string;
-  password: string;
-  displayName: string;
-}
-
-export interface SendRequest {
-  to: string;
-  subject: string;
-  body: string;
-  html?: boolean;
-}
-
-export interface BlacklistEntry {
-  senderEmail: string;
-  reason?: string;
-}
-
-export interface Contact {
-  id?: number;
-  name: string;
-  email: string;
-  phone?: string;
-  company?: string;
-}
-
-export interface PageResponse<T> {
-  content: T[];
-  number: number;
-  size: number;
-  totalElements: number;
-  totalPages: number;
-}

frontend/src/app/pages/auth/auth-frame.component.ts

@@ -0,0 +1,35 @@
+import { ChangeDetectionStrategy, Component, input } from '@angular/core';
+import { BackgroundComponent } from '../../ui/background.component';
+
+/** Logo + a glass card over the synthwave background — the login and registration pages. */
+@Component({
+  selector: 'app-auth-frame',
+  imports: [BackgroundComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <app-background />
+    <main class="relative z-10 min-h-screen flex items-center justify-center p-4">
+      <div class="w-full max-w-md">
+        <div class="flex items-center justify-center gap-3 mb-6">
+          <div class="w-12 h-12 rounded-lg bg-gradient-to-br from-pink-500 to-cyan-400 flex items-center justify-center
+                      text-slate-950 font-black text-2xl shadow-[0_0_15px_rgba(255,0,127,0.8)] font-orbitron">M</div>
+          <div>
+            <h1 class="text-3xl font-extrabold font-orbitron tracking-wider neon-text-primary">
+              SYNTH <span class="text-cyan-400 font-normal">MAIL</span>
+            </h1>
+            <p class="text-xs text-cyan-300/70 font-mono tracking-widest uppercase">Reactive mail server</p>
+          </div>
+        </div>
+        <section class="glass-panel static p-6 sm:p-8" [attr.aria-labelledby]="'auth-title'">
+          <h2 id="auth-title" class="text-xl font-orbitron font-bold neon-text-secondary mb-1">{{ title() }}</h2>
+          <p class="text-xs text-slate-400 font-mono mb-6">{{ subtitle() }}</p>
+          <ng-content />
+        </section>
+      </div>
+    </main>
+  `
+})
+export class AuthFrameComponent {
+  readonly title = input.required<string>();
+  readonly subtitle = input('');
+}

frontend/src/app/pages/auth/login.page.ts

@@ -0,0 +1,80 @@
+import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { Router, RouterLink } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { ApiService } from '../../core/api.service';
+import { AuthService } from '../../core/auth.service';
+import { errorText } from '../../core/models';
+import { AuthFrameComponent } from './auth-frame.component';
+
+@Component({
+  selector: 'app-login',
+  imports: [FormsModule, RouterLink, MatIconModule, AuthFrameComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <app-auth-frame title="LOG IN" subtitle="Your mailbox address and password">
+      <form (ngSubmit)="submit()" class="space-y-4">
+        <div>
+          <label class="synth-label" for="email">Email</label>
+          <input id="email" name="email" type="email" class="synth-input" [(ngModel)]="email" required
+                 autocomplete="username" placeholder="you@domain">
+        </div>
+        <div>
+          <label class="synth-label" for="password">Password</label>
+          <div class="relative">
+            <input id="password" name="password" [type]="show() ? 'text' : 'password'" class="synth-input pr-10"
+                   [(ngModel)]="password" required autocomplete="current-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="show() ? 'Hide password' : 'Show password'" (click)="show.set(!show())">
+              <mat-icon>{{ show() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button>
+          </div>
+        </div>
+        @if (error()) {
+          <p class="text-sm text-pink-400 font-rajdhani flex items-center gap-2" role="alert">
+            <mat-icon class="!text-lg">error</mat-icon>{{ error() }}
+          </p>
+        }
+        <button type="submit" class="cyber-btn w-full py-2.5 rounded-xl font-bold text-sm" [disabled]="busy()">
+          <mat-icon>login</mat-icon> {{ busy() ? 'LOGGING IN…' : 'LOG IN' }}
+        </button>
+      </form>
+      @if (registration()) {
+        <p class="mt-6 text-center text-sm text-slate-400 font-rajdhani">
+          No mailbox yet? <a routerLink="/register" class="text-cyan-300 hover:text-pink-400 font-semibold">Create one</a>
+        </p>
+      }
+    </app-auth-frame>
+  `
+})
+export class LoginPage {
+  private auth = inject(AuthService);
+  private router = inject(Router);
+
+  email = '';
+  password = '';
+  readonly show = signal(false);
+  readonly busy = signal(false);
+  readonly error = signal('');
+  readonly registration = signal(false);
+
+  constructor() {
+    inject(ApiService).config().subscribe({ next: c => this.registration.set(c.registrationEnabled), error: () => {} });
+  }
+
+  submit(): void {
+    if (!this.email.trim() || !this.password) {
+      this.error.set('Enter the email and the password');
+      return;
+    }
+    this.busy.set(true);
+    this.error.set('');
+    this.auth.login(this.email.trim(), this.password).subscribe({
+      next: () => this.router.navigate(['/']),
+      error: e => {
+        this.busy.set(false);
+        this.error.set(errorText(e) === 'Invalid credentials' ? 'Wrong email or password' : errorText(e));
+      }
+    });
+  }
+}

frontend/src/app/pages/auth/register.page.ts

@@ -0,0 +1,128 @@
+import { ChangeDetectionStrategy, Component, computed, inject, signal } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { Router, RouterLink } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { ApiService } from '../../core/api.service';
+import { AuthService } from '../../core/auth.service';
+import { errorText } from '../../core/models';
+import { AuthFrameComponent } from './auth-frame.component';
+
+const NAME = /^[a-z0-9]([a-z0-9._-]{0,62}[a-z0-9])?$/;
+
+@Component({
+  selector: 'app-register',
+  imports: [FormsModule, RouterLink, MatIconModule, AuthFrameComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <app-auth-frame title="NEW MAILBOX" subtitle="Pick an address — you are logged in right away">
+      @if (!loaded()) {
+        <p class="text-slate-400 font-mono text-sm">Loading…</p>
+      } @else if (!enabled()) {
+        <p class="text-slate-300 font-rajdhani mb-4">Registration is closed on this server. Ask the administrator for a mailbox.</p>
+        <a routerLink="/login" class="cyber-btn w-full py-2.5 rounded-xl font-bold text-sm"><mat-icon>arrow_back</mat-icon> BACK TO LOGIN</a>
+      } @else {
+        <form (ngSubmit)="submit()" class="space-y-4">
+          <div>
+            <label class="synth-label" for="local">Address</label>
+            <div class="flex items-stretch gap-2">
+              <input id="local" name="local" class="synth-input" [ngModel]="local()" (ngModelChange)="local.set($event.toLowerCase())"
+                     required autocomplete="username" placeholder="name" aria-describedby="local-hint">
+              <span class="flex items-center text-cyan-300 font-mono">&#64;</span>
+              @if (domains().length > 1) {
+                <select name="domain" class="synth-input !w-auto" [ngModel]="domain()" (ngModelChange)="domain.set($event)"
+                        aria-label="Domain">
+                  @for (d of domains(); track d) { <option [value]="d">{{ d }}</option> }
+                </select>
+              } @else {
+                <span class="flex items-center px-3 rounded-[10px] bg-slate-900/70 border border-cyan-500/30 font-mono text-sm text-slate-200">
+                  {{ domain() }}
+                </span>
+              }
+            </div>
+            <p id="local-hint" class="mt-1 text-[11px] font-mono" [class]="localValid() || !local() ? 'text-slate-500' : 'text-pink-400'">
+              Letters, digits, dot, dash, underscore
+            </p>
+          </div>
+          <div>
+            <label class="synth-label" for="name">Your name (shown to recipients)</label>
+            <input id="name" name="name" class="synth-input" [(ngModel)]="displayName" maxlength="100" autocomplete="name">
+          </div>
+          <div>
+            <label class="synth-label" for="password">Password (8+ characters)</label>
+            <div class="relative"><input id="password" name="password" [type]="show() ? 'text' : 'password'" class="synth-input pr-10" [ngModel]="password()"
+                   (ngModelChange)="password.set($event)" required minlength="8" autocomplete="new-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="show() ? 'Hide password' : 'Show password'" (click)="show.set(!show())">
+              <mat-icon>{{ show() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button></div>
+          </div>
+          <div>
+            <label class="synth-label" for="password2">Password again</label>
+            <div class="relative"><input id="password2" name="password2" [type]="show() ? 'text' : 'password'" class="synth-input pr-10" [ngModel]="password2()"
+                   (ngModelChange)="password2.set($event)" required autocomplete="new-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="show() ? 'Hide password' : 'Show password'" (click)="show.set(!show())">
+              <mat-icon>{{ show() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button></div>
+          </div>
+          @if (error()) {
+            <p class="text-sm text-pink-400 font-rajdhani flex items-center gap-2" role="alert">
+              <mat-icon class="!text-lg">error</mat-icon>{{ error() }}
+            </p>
+          }
+          <button type="submit" class="cyber-btn w-full py-2.5 rounded-xl font-bold text-sm" [disabled]="busy()">
+            <mat-icon>person_add</mat-icon> {{ busy() ? 'CREATING…' : 'CREATE MAILBOX' }}
+          </button>
+        </form>
+        <p class="mt-6 text-center text-sm text-slate-400 font-rajdhani">
+          Have a mailbox? <a routerLink="/login" class="text-cyan-300 hover:text-pink-400 font-semibold">Log in</a>
+        </p>
+      }
+    </app-auth-frame>
+  `
+})
+export class RegisterPage {
+  private auth = inject(AuthService);
+  private router = inject(Router);
+
+  readonly loaded = signal(false);
+  readonly enabled = signal(false);
+  readonly show = signal(false);
+  readonly domains = signal<string[]>([]);
+  readonly domain = signal('');
+  readonly local = signal('');
+  readonly password = signal('');
+  readonly password2 = signal('');
+  displayName = '';
+  readonly busy = signal(false);
+  readonly error = signal('');
+  readonly localValid = computed(() => NAME.test(this.local()));
+
+  constructor() {
+    inject(ApiService).config().subscribe({
+      next: c => {
+        this.enabled.set(c.registrationEnabled);
+        this.domains.set(c.domains);
+        this.domain.set(c.domains[0] ?? '');
+        this.loaded.set(true);
+      },
+      error: e => { this.loaded.set(true); this.error.set(errorText(e)); }
+    });
+  }
+
+  submit(): void {
+    const problem = !this.localValid() ? 'The address: letters, digits, dot, dash, underscore'
+      : this.password().length < 8 ? 'The password is shorter than 8 characters'
+      : this.password() !== this.password2() ? 'The passwords do not match' : '';
+    if (problem) {
+      this.error.set(problem);
+      return;
+    }
+    this.busy.set(true);
+    this.error.set('');
+    this.auth.register(`${this.local()}@${this.domain()}`, this.password(), this.displayName.trim()).subscribe({
+      next: () => this.router.navigate(['/']),
+      error: e => { this.busy.set(false); this.error.set(errorText(e)); }
+    });
+  }
+}

frontend/src/app/pages/blocked/blocked.page.ts

@@ -0,0 +1,100 @@
+import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
+import { DatePipe } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { MatIconModule } from '@angular/material/icon';
+import {
+  JtGridBulkEvent, JtGridBulkService, JtGridCellDirective, JtGridColumn, JtGridComponent, JtGridRowEvent, RowAction
+} from '@jambotron/aria-grid';
+import { ApiService } from '../../core/api.service';
+import { BlacklistEntry, errorText } from '../../core/models';
+import { ToastService } from '../../ui/toast.service';
+
+/** Blocked senders: their mail goes straight to Spam. */
+@Component({
+  selector: 'app-blocked',
+  imports: [DatePipe, FormsModule, MatIconModule, JtGridComponent, JtGridCellDirective],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <section class="glass-panel static p-4 md:p-6" aria-labelledby="blocked-title">
+      <div class="flex items-center gap-3 mb-4">
+        <mat-icon class="text-pink-400">block</mat-icon>
+        <div>
+          <h1 id="blocked-title" class="text-xl font-orbitron font-bold neon-text-secondary">BLOCKED SENDERS</h1>
+          <p class="text-xs text-slate-400 font-mono">Messages from these addresses go straight to Spam</p>
+        </div>
+      </div>
+
+      <form class="flex flex-wrap items-end gap-3 mb-5 p-4 rounded-xl bg-slate-950/50 border border-pink-500/20" (ngSubmit)="add()">
+        <div class="flex-grow min-w-[220px]">
+          <label class="synth-label" for="b-email">Sender address</label>
+          <input id="b-email" name="email" type="email" class="synth-input" [(ngModel)]="email" placeholder="spammer@example.com">
+        </div>
+        <div class="flex-grow min-w-[180px]">
+          <label class="synth-label" for="b-reason">Reason (optional)</label>
+          <input id="b-reason" name="reason" class="synth-input" [(ngModel)]="reason" maxlength="255">
+        </div>
+        <button type="submit" class="cyber-btn px-4 py-2.5 rounded-lg text-xs font-bold"><mat-icon>block</mat-icon> BLOCK</button>
+      </form>
+
+      <jt-grid [rows]="entries()" [columns]="columns" [trackBy]="bySender" label="Blocked senders"
+               [emptyMessage]="loading() ? 'Loading…' : 'Nobody is blocked'" [bulkActions]="bulkActions" (bulkAction)="onBulk($event)"
+               [rowActions]="rowActions" (rowAction)="onRow($event)" [rowSubject]="senderOf" [initialSort]="{ key: 'date', direction: 'desc' }">
+        <ng-template jtGridCell="sender" let-row><span class="font-mono text-sm text-cyan-300">{{ row.senderEmail }}</span></ng-template>
+        <ng-template jtGridCell="reason" let-row><span class="text-slate-300">{{ row.reason || '' }}</span></ng-template>
+        <ng-template jtGridCell="date" let-row><span class="font-mono text-xs text-slate-400">{{ row.createdAt | date: 'd MMM y, HH:mm' }}</span></ng-template>
+      </jt-grid>
+    </section>
+  `
+})
+export class BlockedPage {
+  private api = inject(ApiService);
+  private bulk = inject(JtGridBulkService);
+  private toasts = inject(ToastService);
+
+  readonly entries = signal<BlacklistEntry[]>([]);
+  readonly loading = signal(true);
+  email = '';
+  reason = '';
+
+  readonly columns: JtGridColumn<BlacklistEntry>[] = [
+    { key: 'sender', label: 'Sender', sort: e => e.senderEmail },
+    { key: 'reason', label: 'Reason', sort: e => e.reason || '' },
+    { key: 'date', label: 'Blocked', sort: e => e.createdAt || '', align: 'end' }
+  ];
+  readonly bulkActions: RowAction[] = [{ value: 'unblock', label: 'Unblock', icon: 'lock_open' }];
+  readonly rowActions = (): RowAction[] => [{ value: 'unblock', label: 'Unblock', icon: 'lock_open', inline: true }];
+  readonly bySender = (e: BlacklistEntry) => e.senderEmail;
+  readonly senderOf = (e: BlacklistEntry) => e.senderEmail;
+
+  constructor() { this.load(); }
+
+  load(): void {
+    this.api.blacklist().subscribe({
+      next: list => { this.entries.set(list); this.loading.set(false); },
+      error: e => { this.loading.set(false); this.toasts.error(errorText(e)); }
+    });
+  }
+
+  add(): void {
+    const email = this.email.trim().toLowerCase();
+    if (!/^[^@\s]+@[^@\s]+$/.test(email)) {
+      this.toasts.error('Enter a valid sender address');
+      return;
+    }
+    this.api.block(email, this.reason.trim()).subscribe({
+      next: () => { this.toasts.ok(`${email} blocked`); this.email = ''; this.reason = ''; this.load(); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  onRow(e: JtGridRowEvent<BlacklistEntry>): void {
+    this.api.unblock(e.row.senderEmail).subscribe({
+      next: () => { this.toasts.ok(`${e.row.senderEmail} unblocked`); this.load(); },
+      error: err => this.toasts.error(errorText(err))
+    });
+  }
+
+  onBulk(e: JtGridBulkEvent<BlacklistEntry>): void {
+    this.bulk.run({ rows: e.rows, label: 'Unblock', run: x => this.api.unblock(x.senderEmail) }).subscribe(() => this.load());
+  }
+}

frontend/src/app/pages/compose/compose.page.ts

@@ -0,0 +1,370 @@
+import { ChangeDetectionStrategy, Component, DestroyRef, computed, effect, inject, input, signal, untracked } from '@angular/core';
+import { NgTemplateOutlet } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { Router } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { MatTooltipModule } from '@angular/material/tooltip';
+import { Observable, of, switchMap, tap } from 'rxjs';
+import { ApiService } from '../../core/api.service';
+import { MailStateService } from '../../core/mail-state.service';
+import { Attachment, Contact, Draft, Message, errorText, formatBytes } from '../../core/models';
+import { DialogService } from '../../ui/dialog.service';
+import { ToastService } from '../../ui/toast.service';
+
+const MAX_FILE = 10 * 1024 * 1024;
+
+/**
+ * New message, reply, reply all, forward, or a draft being edited. A draft is saved on the server
+ * (automatically every 15 s while there are changes, and before attaching a file — files belong to the draft).
+ */
+@Component({
+  selector: 'app-compose',
+  imports: [FormsModule, NgTemplateOutlet, MatIconModule, MatTooltipModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <section class="glass-panel static p-4 md:p-6" aria-labelledby="compose-title">
+      <div class="flex flex-wrap items-center justify-between gap-3 mb-5">
+        <h1 id="compose-title" class="text-xl font-orbitron font-bold neon-text-secondary">{{ title() }}</h1>
+        <span class="text-xs font-mono" [class]="dirty() ? 'text-yellow-300' : 'text-slate-500'" aria-live="polite">
+          {{ saving() ? 'Saving…' : dirty() ? 'Unsaved changes' : draftId() ? 'Draft saved' : '' }}
+        </span>
+      </div>
+
+      <form (ngSubmit)="send()" class="space-y-4">
+        <div class="relative">
+          <div class="flex items-center justify-between">
+            <label class="synth-label" for="to">To</label>
+            @if (!showCc()) {
+              <button type="button" class="text-[11px] font-mono text-cyan-300 hover:text-pink-400 mb-1" (click)="showCc.set(true)">+ Cc</button>
+            }
+          </div>
+          <input id="to" name="to" class="synth-input" [ngModel]="to()" (ngModelChange)="to.set($event); touch()"
+                 (focus)="focused.set('to')" (blur)="blurLater()" autocomplete="off" placeholder="name@domain, another@domain"
+                 role="combobox" aria-autocomplete="list" [attr.aria-expanded]="focused() === 'to' && suggestions().length > 0"
+                 aria-controls="suggest-to">
+          @if (focused() === 'to') { <ng-container *ngTemplateOutlet="suggest; context: { field: 'to' }" /> }
+        </div>
+        @if (showCc()) {
+          <div class="relative">
+            <label class="synth-label" for="cc">Cc</label>
+            <input id="cc" name="cc" class="synth-input" [ngModel]="cc()" (ngModelChange)="cc.set($event); touch()"
+                   (focus)="focused.set('cc')" (blur)="blurLater()" autocomplete="off"
+                   role="combobox" aria-autocomplete="list" [attr.aria-expanded]="focused() === 'cc' && suggestions().length > 0"
+                   aria-controls="suggest-cc">
+            @if (focused() === 'cc') { <ng-container *ngTemplateOutlet="suggest; context: { field: 'cc' }" /> }
+          </div>
+        }
+        <div>
+          <label class="synth-label" for="subject">Subject</label>
+          <input id="subject" name="subject" class="synth-input" [ngModel]="subject()" (ngModelChange)="subject.set($event); touch()"
+                 maxlength="1000" autocomplete="off">
+        </div>
+        <div>
+          <label class="synth-label" for="body">Message</label>
+          <textarea id="body" name="body" rows="14" class="synth-input font-rajdhani leading-relaxed resize-y"
+                    [ngModel]="body()" (ngModelChange)="body.set($event); touch()"></textarea>
+        </div>
+
+        <div>
+          <div class="flex flex-wrap items-center gap-2">
+            <label class="ghost-btn cursor-pointer" [class.opacity-50]="uploading()">
+              <mat-icon>attach_file</mat-icon> Attach files
+              <input type="file" multiple class="sr-only" (change)="attach($event)" [disabled]="uploading()">
+            </label>
+            <span class="text-[11px] font-mono text-slate-500">up to 10 MB each</span>
+            @if (uploading()) { <span class="text-xs font-mono text-cyan-300">Uploading…</span> }
+          </div>
+          @if (attachments().length) {
+            <ul class="flex flex-wrap gap-2 mt-3" aria-label="Attached files">
+              @for (a of attachments(); track a.id) {
+                <li class="flex items-center gap-2 pl-3 pr-1 py-1 rounded-lg bg-slate-900/70 border border-cyan-500/30 text-sm">
+                  <mat-icon class="!text-base text-cyan-300">attach_file</mat-icon>
+                  <span class="max-w-[220px] truncate text-slate-200">{{ a.filename }}</span>
+                  <span class="text-xs font-mono text-slate-500">{{ size(a.sizeBytes) }}</span>
+                  <button type="button" class="text-slate-400 hover:text-pink-400 p-1" [attr.aria-label]="'Remove ' + a.filename"
+                          (click)="detach(a)"><mat-icon class="!text-lg">close</mat-icon></button>
+                </li>
+              }
+            </ul>
+          }
+        </div>
+
+        @if (error()) {
+          <p class="text-sm text-pink-400 font-rajdhani flex items-center gap-2" role="alert"><mat-icon class="!text-lg">error</mat-icon>{{ error() }}</p>
+        }
+
+        <div class="flex flex-wrap items-center gap-3 pt-2 border-t border-cyan-500/20">
+          <button type="submit" class="cyber-btn px-6 py-2.5 rounded-xl font-bold text-sm" [disabled]="sending() || uploading()">
+            <mat-icon>send</mat-icon> {{ sending() ? 'SENDING…' : 'SEND' }}
+          </button>
+          <button type="button" class="ghost-btn" (click)="saveNow()" [disabled]="saving() || !hasContent()">
+            <mat-icon>save</mat-icon> Save draft
+          </button>
+          <span class="flex-grow"></span>
+          <button type="button" class="ghost-btn danger" (click)="discard()"><mat-icon>delete</mat-icon> Discard</button>
+        </div>
+      </form>
+    </section>
+
+    <ng-template #suggest let-field="field">
+      @if (suggestions().length) {
+        <ul [id]="'suggest-' + field" role="listbox" aria-label="Contacts"
+            class="absolute z-30 w-full mt-1 bg-slate-950/95 border border-pink-500/40 rounded-xl shadow-2xl py-1 backdrop-blur-2xl">
+          @for (c of suggestions(); track c.email) {
+            <li role="option" aria-selected="false" class="px-4 py-2 text-sm cursor-pointer hover:bg-cyan-500/20 flex gap-2"
+                (mousedown)="$event.preventDefault(); pick(field, c)">
+              <span class="text-slate-200 font-semibold">{{ c.name || c.email }}</span>
+              @if (c.name) { <span class="text-cyan-300 font-mono text-xs self-center">{{ c.email }}</span> }
+            </li>
+          }
+        </ul>
+      }
+    </ng-template>
+  `
+})
+export class ComposePage {
+  readonly draft = input<string>();
+  readonly reply = input<string>();
+  readonly replyAll = input<string>();
+  readonly forward = input<string>();
+  readonly toParam = input<string>(undefined, { alias: 'to' });
+
+  private api = inject(ApiService);
+  private state = inject(MailStateService);
+  private dialogs = inject(DialogService);
+  private toasts = inject(ToastService);
+  private router = inject(Router);
+
+  readonly to = signal('');
+  readonly cc = signal('');
+  readonly subject = signal('');
+  readonly body = signal('');
+  readonly showCc = signal(false);
+  readonly draftId = signal<number | null>(null);
+  readonly attachments = signal<Attachment[]>([]);
+  readonly dirty = signal(false);
+  readonly saving = signal(false);
+  readonly sending = signal(false);
+  readonly uploading = signal(false);
+  readonly error = signal('');
+  readonly focused = signal<'to' | 'cc' | null>(null);
+  private contacts = signal<Contact[]>([]);
+  private done = false;
+
+  readonly title = computed(() => this.reply() ? 'REPLY' : this.replyAll() ? 'REPLY ALL' : this.forward() ? 'FORWARD'
+    : this.draft() ? 'EDIT DRAFT' : 'NEW MESSAGE');
+  readonly hasContent = computed(() => !!(this.to().trim() || this.cc().trim() || this.subject().trim() || this.body().trim()));
+
+  /** Contacts matching the address being typed (after the last comma). */
+  readonly suggestions = computed(() => {
+    const field = this.focused();
+    if (!field) return [];
+    const value = field === 'to' ? this.to() : this.cc();
+    const typed = value.split(/[,;]/).pop()!.trim().toLowerCase();
+    if (!typed) return [];
+    const taken = value.toLowerCase();
+    return this.contacts()
+      .filter(c => !taken.includes(c.email.toLowerCase()) &&
+        (c.email.toLowerCase().includes(typed) || (c.name || '').toLowerCase().includes(typed)))
+      .slice(0, 6);
+  });
+
+  constructor() {
+    this.api.contacts().subscribe({ next: c => this.contacts.set(c), error: () => {} });
+    effect(() => {
+      const draft = this.draft(), reply = this.reply(), replyAll = this.replyAll(), forward = this.forward(), to = this.toParam();
+      untracked(() => this.init(draft, reply, replyAll, forward, to));
+    });
+    const timer = setInterval(() => { if (this.dirty() && !this.saving() && !this.sending()) this.save().subscribe(); }, 15000);
+    inject(DestroyRef).onDestroy(() => {
+      clearInterval(timer);
+      if (!this.done && this.dirty() && this.hasContent()) this.save().subscribe();
+    });
+  }
+
+  private init(draft?: string, reply?: string, replyAll?: string, forward?: string, to?: string): void {
+    const source = draft ?? reply ?? replyAll ?? forward;
+    if (to) this.to.set(to);
+    if (!source) return;
+    this.api.message(Number(source)).subscribe({
+      next: m => {
+        if (draft) this.fromDraft(m);
+        else if (forward) this.fromForward(m);
+        else this.fromReply(m, !!replyAll);
+      },
+      error: e => this.error.set(errorText(e))
+    });
+  }
+
+  private fromDraft(m: Message): void {
+    this.draftId.set(m.id);
+    this.to.set(m.recipientEmail || '');
+    this.cc.set(m.ccEmail || '');
+    this.showCc.set(!!m.ccEmail);
+    this.subject.set(m.subject || '');
+    this.body.set(m.body || '');
+    if (m.attachmentCount) this.api.attachments(m.id).subscribe({ next: a => this.attachments.set(a), error: () => {} });
+  }
+
+  private fromReply(m: Message, all: boolean): void {
+    const me = (this.state.profile()?.email ?? '').toLowerCase();
+    this.to.set(m.senderEmail);
+    if (all) {
+      const others = [...m.recipientEmail.split(','), ...(m.ccEmail ? m.ccEmail.split(',') : [])]
+        .map(a => a.trim()).filter(a => a && a.toLowerCase() !== me && a.toLowerCase() !== m.senderEmail.toLowerCase());
+      if (others.length) { this.cc.set(others.join(', ')); this.showCc.set(true); }
+    }
+    this.subject.set(prefixed('Re: ', m.subject));
+    this.body.set(`\n\n${header(m)} wrote:\n${quote(m)}`);
+    this.dirty.set(true);
+  }
+
+  private fromForward(m: Message): void {
+    this.subject.set(prefixed('Fwd: ', m.subject));
+    this.body.set(`\n\n---------- Forwarded message ----------\nFrom: ${header(m)}\nDate: ${new Date(m.receivedAt).toLocaleString()}\n`
+      + `Subject: ${m.subject || ''}\nTo: ${m.recipientEmail}\n\n${plain(m)}`);
+    this.dirty.set(true);
+    if (m.attachmentCount) this.toasts.ok('Attachments of the original are not forwarded — attach them again if needed');
+  }
+
+  touch(): void { this.dirty.set(true); this.error.set(''); }
+
+  blurLater(): void { setTimeout(() => this.focused.set(null), 150); }
+
+  pick(field: 'to' | 'cc', contact: Contact): void {
+    const target = field === 'to' ? this.to : this.cc;
+    const parts = target().split(/[,;]/).map(p => p.trim());
+    parts[parts.length - 1] = contact.email;
+    target.set(parts.filter(Boolean).join(', ') + ', ');
+    this.touch();
+  }
+
+  private current(): Draft {
+    return { to: this.to().trim(), cc: this.showCc() ? this.cc().trim() : '', subject: this.subject(), body: this.body(), html: false };
+  }
+
+  /** Creates the draft on the first save, updates it afterwards. */
+  private save(): Observable<number> {
+    const id = this.draftId();
+    this.saving.set(true);
+    const request = id ? this.api.updateDraft(id, this.current()) : this.api.createDraft(this.current());
+    return request.pipe(
+      tap({
+        next: m => { this.draftId.set(m.id); this.dirty.set(false); this.saving.set(false); this.state.refreshFolders(); },
+        error: e => { this.saving.set(false); this.error.set('Draft not saved: ' + errorText(e)); }
+      }),
+      switchMap(m => of(m.id))
+    );
+  }
+
+  saveNow(): void {
+    this.save().subscribe({ next: () => this.toasts.ok('Draft saved'), error: () => {} });
+  }
+
+  attach(event: Event): void {
+    const field = event.target as HTMLInputElement;
+    const files = Array.from(field.files ?? []);
+    // the input is cleared only after the upload: Chrome cannot read a File whose input was reset
+    const reset = () => { field.value = ''; };
+    const tooBig = files.filter(f => f.size > MAX_FILE);
+    if (tooBig.length) this.toasts.error(`Too big (over 10 MB): ${tooBig.map(f => f.name).join(', ')}`);
+    const ok = files.filter(f => f.size <= MAX_FILE);
+    if (!ok.length) { reset(); return; }
+    this.uploading.set(true);
+    const id = this.draftId();
+    (id && !this.dirty() ? of(id) : this.save()).subscribe({
+      next: draftId => this.uploadNext(draftId, ok, reset),
+      error: () => { this.uploading.set(false); reset(); }
+    });
+  }
+
+  private uploadNext(draftId: number, files: File[], done: () => void): void {
+    const [file, ...rest] = files;
+    if (!file) {
+      this.uploading.set(false);
+      done();
+      return;
+    }
+    this.api.upload(draftId, file).subscribe({
+      next: a => { this.attachments.update(list => [...list, a]); this.uploadNext(draftId, rest, done); },
+      error: e => { this.toasts.error(`${file.name}: ${errorText(e)}`); this.uploadNext(draftId, rest, done); }
+    });
+  }
+
+  detach(a: Attachment): void {
+    this.api.deleteAttachment(a.id).subscribe({
+      next: () => this.attachments.update(list => list.filter(x => x.id !== a.id)),
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  send(): void {
+    if (!this.to().trim()) {
+      this.error.set('Who is it for? Fill in "To"');
+      return;
+    }
+    const go = () => {
+      this.sending.set(true);
+      this.error.set('');
+      this.api.send(this.current(), this.draftId()).subscribe({
+        next: () => {
+          this.done = true;
+          this.toasts.ok('Message sent');
+          this.state.refreshFolders();
+          this.state.refreshProfile();
+          const sent = this.state.system('Sent');
+          this.router.navigate(sent ? ['/folder', sent.id] : ['/']);
+        },
+        error: e => { this.sending.set(false); this.error.set(errorText(e)); }
+      });
+    };
+    if (!this.subject().trim()) {
+      this.dialogs.confirm('Send without a subject?', 'The message has no subject.', 'Send').subscribe(ok => ok !== null && go());
+    } else {
+      go();
+    }
+  }
+
+  discard(): void {
+    const id = this.draftId();
+    const leave = () => {
+      this.done = true;
+      this.router.navigate(['/']);
+    };
+    if (!id && !this.hasContent()) {
+      leave();
+      return;
+    }
+    this.dialogs.confirm('Discard this message?', id ? 'The draft and its attachments are deleted.' : 'What you typed is lost.', 'Discard', true)
+      .subscribe(ok => {
+        if (ok === null) return;
+        if (!id) { leave(); return; }
+        // a draft: to the Trash, then out of it
+        this.api.deleteMessage(id).pipe(switchMap(() => this.api.deleteMessage(id))).subscribe({
+          next: () => { this.state.refreshFolders(); leave(); },
+          error: () => { this.state.refreshFolders(); leave(); }
+        });
+      });
+  }
+
+  size(bytes: number): string { return formatBytes(bytes); }
+}
+
+function prefixed(prefix: string, subject: string): string {
+  const s = subject || '';
+  return s.toLowerCase().startsWith(prefix.toLowerCase()) ? s : prefix + s;
+}
+
+function header(m: Message): string {
+  return m.senderName ? `${m.senderName} <${m.senderEmail}>` : m.senderEmail;
+}
+
+function plain(m: Message): string {
+  if (!m.html) return m.body || '';
+  const doc = new DOMParser().parseFromString(m.body || '', 'text/html');
+  return (doc.body.textContent || '').replace(/\n{3,}/g, '\n\n').trim();
+}
+
+function quote(m: Message): string {
+  return plain(m).split('\n').map(line => '> ' + line).join('\n');
+}

frontend/src/app/pages/contacts/contacts.page.ts

@@ -0,0 +1,151 @@
+import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { Router } from '@angular/router';
+import { A11yModule } from '@angular/cdk/a11y';
+import { MatIconModule } from '@angular/material/icon';
+import {
+  JtGridBulkEvent, JtGridBulkService, JtGridCellDirective, JtGridColumn, JtGridComponent, JtGridRowEvent, RowAction
+} from '@jambotron/aria-grid';
+import { ApiService } from '../../core/api.service';
+import { Contact, errorText } from '../../core/models';
+import { DialogService } from '../../ui/dialog.service';
+import { ToastService } from '../../ui/toast.service';
+
+/** Address book: grid, add/edit form, write to a contact. */
+@Component({
+  selector: 'app-contacts',
+  imports: [FormsModule, A11yModule, MatIconModule, JtGridComponent, JtGridCellDirective],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <section class="glass-panel static p-4 md:p-6" aria-labelledby="contacts-title">
+      <div class="flex flex-wrap items-center justify-between gap-3 mb-4">
+        <div class="flex items-center gap-3">
+          <mat-icon class="text-pink-400">contacts</mat-icon>
+          <div>
+            <h1 id="contacts-title" class="text-xl font-orbitron font-bold neon-text-secondary">CONTACTS</h1>
+            <p class="text-xs text-slate-400 font-mono">{{ contacts().length }} contacts · suggested while you type an address</p>
+          </div>
+        </div>
+        <button type="button" class="cyber-btn px-4 py-2 rounded-lg text-xs font-bold" (click)="edit({ name: '', email: '' })">
+          <mat-icon>person_add</mat-icon> ADD CONTACT
+        </button>
+      </div>
+
+      <jt-grid [rows]="contacts()" [columns]="columns" [trackBy]="byEmail" label="Contacts"
+               [emptyMessage]="loading() ? 'Loading…' : 'No contacts yet'" [bulkActions]="bulkActions" (bulkAction)="onBulk($event)"
+               [rowActions]="rowActions" (rowAction)="onRow($event)" [rowSubject]="nameOf" [initialSort]="{ key: 'name', direction: 'asc' }">
+        <ng-template jtGridCell="name" let-row><span class="font-semibold text-slate-100">{{ row.name || '—' }}</span></ng-template>
+        <ng-template jtGridCell="email" let-row><span class="font-mono text-xs text-cyan-300">{{ row.email }}</span></ng-template>
+        <ng-template jtGridCell="phone" let-row><span class="font-mono text-xs">{{ row.phone || '' }}</span></ng-template>
+        <ng-template jtGridCell="company" let-row>{{ row.company || '' }}</ng-template>
+      </jt-grid>
+    </section>
+
+    @if (editing(); as c) {
+      <div class="fixed inset-0 z-50 flex items-center justify-center p-4 bg-slate-950/80 backdrop-blur-md" (click)="editing.set(null)"
+           (keydown.escape)="editing.set(null)">
+        <form class="glass-panel static max-w-lg w-full p-6 border-2 !border-cyan-400 shadow-[0_0_50px_rgba(0,240,255,0.4)] space-y-4"
+              role="dialog" aria-modal="true" aria-labelledby="contact-form-title" cdkTrapFocus [cdkTrapFocusAutoCapture]="true"
+              (click)="$event.stopPropagation()" (ngSubmit)="save()">
+          <h2 id="contact-form-title" class="text-lg font-orbitron font-bold text-slate-100">{{ c.id ? 'EDIT CONTACT' : 'NEW CONTACT' }}</h2>
+          <div><label class="synth-label" for="c-name">Name</label>
+            <input id="c-name" name="name" class="synth-input" [(ngModel)]="c.name" maxlength="255"></div>
+          <div><label class="synth-label" for="c-email">Email *</label>
+            <input id="c-email" name="email" type="email" class="synth-input" [(ngModel)]="c.email" required maxlength="255"></div>
+          <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
+            <div><label class="synth-label" for="c-phone">Phone</label>
+              <input id="c-phone" name="phone" class="synth-input" [(ngModel)]="c.phone" maxlength="50"></div>
+            <div><label class="synth-label" for="c-company">Company</label>
+              <input id="c-company" name="company" class="synth-input" [(ngModel)]="c.company" maxlength="255"></div>
+          </div>
+          @if (formError()) { <p class="text-sm text-pink-400" role="alert">{{ formError() }}</p> }
+          <div class="flex justify-end gap-3">
+            <button type="button" class="px-4 py-2 rounded-lg text-xs font-mono text-slate-400 hover:text-slate-200" (click)="editing.set(null)">CANCEL [ESC]</button>
+            <button type="submit" class="cyber-btn px-5 py-2 rounded-lg text-xs font-bold">SAVE</button>
+          </div>
+        </form>
+      </div>
+    }
+  `
+})
+export class ContactsPage {
+  private api = inject(ApiService);
+  private bulk = inject(JtGridBulkService);
+  private dialogs = inject(DialogService);
+  private toasts = inject(ToastService);
+  private router = inject(Router);
+
+  readonly contacts = signal<Contact[]>([]);
+  readonly loading = signal(true);
+  readonly editing = signal<Contact | null>(null);
+  readonly formError = signal('');
+
+  readonly columns: JtGridColumn<Contact>[] = [
+    { key: 'name', label: 'Name', sort: c => (c.name || '').toLowerCase() },
+    { key: 'email', label: 'Email', sort: c => c.email.toLowerCase() },
+    { key: 'phone', label: 'Phone', sort: c => c.phone || '' },
+    { key: 'company', label: 'Company', sort: c => (c.company || '').toLowerCase() }
+  ];
+  readonly bulkActions: RowAction[] = [
+    { value: 'write', label: 'Write to them', icon: 'edit' },
+    { value: 'delete', label: 'Delete', icon: 'delete', danger: true }
+  ];
+  readonly rowActions = (): RowAction[] => [
+    { value: 'write', label: 'Write', icon: 'edit', inline: true },
+    { value: 'edit', label: 'Edit', icon: 'manage_accounts', inline: true },
+    { value: 'delete', label: 'Delete', icon: 'delete', danger: true }
+  ];
+  readonly byEmail = (c: Contact) => c.id ?? c.email;
+  readonly nameOf = (c: Contact) => c.name || c.email;
+
+  constructor() { this.load(); }
+
+  load(): void {
+    this.api.contacts().subscribe({
+      next: list => { this.contacts.set(list); this.loading.set(false); },
+      error: e => { this.loading.set(false); this.toasts.error(errorText(e)); }
+    });
+  }
+
+  edit(c: Contact): void {
+    this.formError.set('');
+    this.editing.set({ ...c });
+  }
+
+  save(): void {
+    const c = this.editing();
+    if (!c) return;
+    if (!/^[^@\s]+@[^@\s]+$/.test((c.email || '').trim())) {
+      this.formError.set('Enter a valid email');
+      return;
+    }
+    const body = { name: (c.name || '').trim(), email: c.email.trim(), phone: (c.phone || '').trim(), company: (c.company || '').trim() };
+    (c.id ? this.api.updateContact(c.id, body) : this.api.addContact(body)).subscribe({
+      next: () => { this.editing.set(null); this.toasts.ok(c.id ? 'Contact saved' : 'Contact added'); this.load(); },
+      error: e => this.formError.set(errorText(e).includes('duplicate') ? 'This email is already in contacts' : errorText(e))
+    });
+  }
+
+  onRow(e: JtGridRowEvent<Contact>): void {
+    if (e.action === 'write') this.router.navigate(['/compose', { to: e.row.email }]);
+    if (e.action === 'edit') this.edit(e.row);
+    if (e.action === 'delete') {
+      this.dialogs.confirm(`Delete ${this.nameOf(e.row)}?`, 'The contact is removed from the address book.', 'Delete', true)
+        .subscribe(ok => ok !== null && this.api.deleteContact(e.row.id!).subscribe({
+          next: () => { this.toasts.ok('Contact deleted'); this.load(); },
+          error: err => this.toasts.error(errorText(err))
+        }));
+    }
+  }
+
+  onBulk(e: JtGridBulkEvent<Contact>): void {
+    if (e.action === 'write') {
+      this.router.navigate(['/compose', { to: e.rows.map(c => c.email).join(', ') }]);
+      return;
+    }
+    this.bulk.run({
+      rows: e.rows, label: 'Delete', danger: true, confirm: `Delete ${e.rows.length} contacts?`,
+      run: c => this.api.deleteContact(c.id!)
+    }).subscribe(() => this.load());
+  }
+}

frontend/src/app/pages/folder/folder.page.ts

@@ -0,0 +1,292 @@
+import { ChangeDetectionStrategy, Component, DestroyRef, computed, effect, inject, input, signal } from '@angular/core';
+import { DatePipe } from '@angular/common';
+import { Router, RouterLink } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { MatTooltipModule } from '@angular/material/tooltip';
+import {
+  JtGridBulkEvent, JtGridBulkService, JtGridCellDirective, JtGridColumn, JtGridComponent, JtGridRowEvent, RowAction
+} from '@jambotron/aria-grid';
+import { Observable, forkJoin, of } from 'rxjs';
+import { ApiService } from '../../core/api.service';
+import { MailStateService } from '../../core/mail-state.service';
+import { Message, errorText, folderIcon, folderLabel, formatBytes } from '../../core/models';
+import { DialogService } from '../../ui/dialog.service';
+import { ToastService } from '../../ui/toast.service';
+
+/** One folder: the message list (grid), search, bulk actions, empty Trash/Spam. */
+@Component({
+  selector: 'app-folder',
+  imports: [DatePipe, RouterLink, MatIconModule, MatTooltipModule, JtGridComponent, JtGridCellDirective],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <section class="glass-panel static p-4 md:p-6" [attr.aria-labelledby]="'folder-title'">
+      <div class="flex flex-wrap items-center justify-between gap-3 mb-4">
+        <div class="flex items-center gap-3 min-w-0">
+          <mat-icon class="text-pink-400">{{ icon() }}</mat-icon>
+          <div class="min-w-0">
+            <h1 id="folder-title" class="text-xl font-orbitron font-bold neon-text-secondary truncate">{{ title() }}</h1>
+            <p class="text-xs text-slate-400 font-mono">
+              @if (q()) { Search “{{ q() }}”: {{ messages().length }} found }
+              @else { {{ messages().length }} messages · {{ unread() }} unread }
+            </p>
+          </div>
+        </div>
+        <div class="flex items-center gap-2">
+          @if (q()) {
+            <a [routerLink]="['/folder', folderId()]" class="ghost-btn"><mat-icon>close</mat-icon> Clear search</a>
+          }
+          <button type="button" class="ghost-btn" (click)="load()" [disabled]="loading()" aria-label="Refresh" matTooltip="Refresh">
+            <mat-icon [class.animate-spin]="loading()">refresh</mat-icon>
+          </button>
+          @if (canEmpty()) {
+            <button type="button" class="ghost-btn danger" (click)="empty()" [disabled]="!messages().length">
+              <mat-icon>delete_forever</mat-icon> Empty {{ title() }}
+            </button>
+          }
+        </div>
+      </div>
+
+      @if (error()) {
+        <p class="text-pink-400 font-rajdhani mb-3" role="alert">{{ error() }}</p>
+      }
+
+      <jt-grid [rows]="messages()" [columns]="columns()" [trackBy]="byId" [label]="title() + ' messages'"
+               [emptyMessage]="loading() ? 'Loading…' : q() ? 'Nothing found' : 'No messages here'"
+               [bulkActions]="bulkActions()" (bulkAction)="onBulk($event)"
+               [rowActions]="rowActions" (rowAction)="onRow($event)" [rowSubject]="subjectOf"
+               [highlight]="isUnread" [initialSort]="{ key: 'date', direction: 'desc' }" [pageSize]="25">
+        <ng-template jtGridCell="flag" let-row>
+          <button type="button" class="align-middle" [class]="row.flagged ? 'text-yellow-400' : 'text-slate-600 hover:text-yellow-300'"
+                  [attr.aria-label]="row.flagged ? 'Remove flag' : 'Flag'" [attr.aria-pressed]="row.flagged" (click)="toggleFlag(row)">
+            <mat-icon class="!text-xl">{{ row.flagged ? 'star' : 'star_border' }}</mat-icon>
+          </button>
+        </ng-template>
+        <ng-template jtGridCell="who" let-row>
+          <div class="max-w-[220px] truncate" [class.font-bold]="!row.read" [class.text-white]="!row.read">
+            {{ who(row) }}
+          </div>
+        </ng-template>
+        <ng-template jtGridCell="subject" let-row>
+          <a [routerLink]="link(row)" class="block max-w-[480px] group">
+            <span class="truncate block group-hover:text-cyan-300" [class.font-bold]="!row.read" [class.text-white]="!row.read">
+              @if (!row.read) { <span class="inline-block w-2 h-2 rounded-full bg-pink-500 mr-1.5 align-middle shadow-[0_0_8px_#ff007f]" aria-label="Unread"></span> }
+              {{ row.subject || '(no subject)' }}
+            </span>
+            <span class="truncate block text-xs text-slate-500">{{ row.body }}</span>
+          </a>
+        </ng-template>
+        <ng-template jtGridCell="files" let-row>
+          @if (row.attachmentCount) {
+            <span class="text-cyan-300 text-xs font-mono whitespace-nowrap" [attr.aria-label]="row.attachmentCount + ' attachments'">
+              <mat-icon class="!text-base">attach_file</mat-icon>{{ row.attachmentCount }}
+            </span>
+          }
+        </ng-template>
+        <ng-template jtGridCell="date" let-row>
+          <span class="font-mono text-xs whitespace-nowrap text-slate-400" [title]="row.receivedAt | date: 'medium'">
+            {{ shortDate(row.receivedAt) }}
+          </span>
+        </ng-template>
+        <ng-template jtGridCell="size" let-row>
+          <span class="font-mono text-xs text-slate-500 whitespace-nowrap">{{ size(row) }}</span>
+        </ng-template>
+      </jt-grid>
+    </section>
+  `
+})
+export class FolderPage {
+  readonly id = input.required<string>();
+  readonly q = input<string | undefined>();
+
+  private api = inject(ApiService);
+  private state = inject(MailStateService);
+  private bulk = inject(JtGridBulkService);
+  private dialogs = inject(DialogService);
+  private toasts = inject(ToastService);
+  private router = inject(Router);
+
+  readonly messages = signal<Message[]>([]);
+  readonly loading = signal(false);
+  readonly error = signal('');
+
+  readonly folderId = computed(() => Number(this.id()));
+  readonly folder = computed(() => this.state.folder(this.folderId()));
+  readonly title = computed(() => this.folder() ? folderLabel(this.folder()!) : 'Folder');
+  readonly icon = computed(() => this.folder() ? folderIcon(this.folder()!) : 'folder');
+  readonly kind = computed(() => this.folder()?.system ? this.folder()!.name : 'own');
+  readonly outgoing = computed(() => this.kind() === 'Sent' || this.kind() === 'Drafts');
+  readonly canEmpty = computed(() => this.kind() === 'Trash' || this.kind() === 'Spam');
+  readonly unread = computed(() => this.messages().filter(m => !m.read).length);
+
+  readonly columns = computed<JtGridColumn<Message>[]>(() => [
+    { key: 'flag', label: 'Flag', hiddenLabel: true, sort: m => m.flagged },
+    { key: 'who', label: this.outgoing() ? 'To' : 'From', sort: m => this.who(m).toLowerCase() },
+    { key: 'subject', label: 'Subject', sort: m => (m.subject || '').toLowerCase() },
+    { key: 'files', label: 'Attachments', hiddenLabel: true, sort: m => m.attachmentCount },
+    { key: 'date', label: 'Date', sort: m => m.receivedAt, align: 'end' },
+    { key: 'size', label: 'Size', sort: m => this.bytes(m), align: 'end' }
+  ]);
+
+  readonly bulkActions = computed<RowAction[]>(() => {
+    const here = this.folderId();
+    const moves = this.state.folders()
+      .filter(f => f.id !== here && f.name !== 'Drafts' && f.name !== 'Sent')
+      .map(f => ({ value: 'move:' + f.id, label: 'To ' + folderLabel(f), icon: f.system && f.name === 'Spam' ? 'report' : 'drive_file_move' }));
+    return [
+      { value: 'read', label: 'Mark read', icon: 'drafts' },
+      { value: 'unread', label: 'Mark unread', icon: 'mark_email_unread' },
+      { value: 'flag', label: 'Flag', icon: 'star' },
+      ...moves.filter(m => !m.label.endsWith('Trash')),
+      { value: 'delete', label: this.kind() === 'Trash' ? 'Delete forever' : 'Delete', icon: 'delete', danger: true }
+    ];
+  });
+
+  readonly byId = (m: Message) => m.id;
+  readonly isUnread = (m: Message) => !m.read;
+  readonly subjectOf = (m: Message) => m.subject || '(no subject)';
+
+  readonly rowActions = (m: Message): RowAction[] => {
+    const draft = this.kind() === 'Drafts';
+    const spam = this.kind() === 'Spam';
+    return [
+      draft ? { value: 'edit', label: 'Edit draft', icon: 'edit', inline: true }
+            : { value: 'reply', label: 'Reply', icon: 'reply', inline: true },
+      ...(draft ? [] : [{ value: 'forward', label: 'Forward', icon: 'forward' }]),
+      { value: m.read ? 'unread' : 'read', label: m.read ? 'Mark unread' : 'Mark read', icon: m.read ? 'mark_email_unread' : 'drafts' },
+      ...(this.outgoing() ? [] : [spam ? { value: 'notspam', label: 'Not spam', icon: 'inbox' } : { value: 'spam', label: 'Spam', icon: 'report' }]),
+      { value: 'delete', label: this.kind() === 'Trash' ? 'Delete forever' : 'Delete', icon: 'delete', danger: true }
+    ];
+  };
+
+  constructor() {
+    effect(() => {
+      this.folderId();
+      this.q();
+      this.load();
+    });
+    const timer = setInterval(() => { if (!this.q() && !document.hidden) this.load(true); }, 30000);
+    inject(DestroyRef).onDestroy(() => clearInterval(timer));
+  }
+
+  load(quiet = false): void {
+    const id = this.folderId();
+    if (!id) return;
+    if (!quiet) this.loading.set(true);
+    const q = this.q()?.trim();
+    (q ? this.api.search(id, q) : this.api.messages(id)).subscribe({
+      next: list => { this.messages.set(list); this.loading.set(false); this.error.set(''); },
+      error: e => { this.loading.set(false); if (!quiet) this.error.set(errorText(e)); }
+    });
+  }
+
+  who(m: Message): string {
+    return this.outgoing() ? (m.recipientEmail || '(no recipient)') : (m.senderName || m.senderEmail);
+  }
+
+  link(m: Message): unknown[] {
+    return this.kind() === 'Drafts' ? ['/compose', { draft: m.id }] : ['/message', m.id];
+  }
+
+  bytes(m: Message): number { return m.messageSize ?? 0; }
+  size(m: Message): string { return formatBytes(m.messageSize); }
+
+  shortDate(value: string): string {
+    const date = new Date(value);
+    const now = new Date();
+    return date.toDateString() === now.toDateString()
+      ? date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
+      : date.toLocaleDateString([], { day: 'numeric', month: 'short', ...(date.getFullYear() !== now.getFullYear() ? { year: 'numeric' } : {}) });
+  }
+
+  toggleFlag(m: Message): void {
+    this.patch(m, { flagged: !m.flagged });
+  }
+
+  onRow(e: JtGridRowEvent<Message>): void {
+    const m = e.row;
+    switch (e.action) {
+      case 'edit': this.router.navigate(['/compose', { draft: m.id }]); break;
+      case 'reply': this.router.navigate(['/compose', { reply: m.id }]); break;
+      case 'forward': this.router.navigate(['/compose', { forward: m.id }]); break;
+      case 'read': case 'unread':
+        this.patch(m, { read: e.action === 'read' });
+        break;
+      case 'spam': this.moveTo([m], this.state.system('Spam')?.id, 'Moved to Spam'); break;
+      case 'notspam': this.moveTo([m], this.state.inbox()?.id, 'Moved to Inbox'); break;
+      case 'delete':
+        if (this.kind() === 'Trash') {
+          this.dialogs.confirm('Delete forever?', `"${this.subjectOf(m)}" cannot be restored.`, 'Delete', true)
+            .subscribe(ok => ok !== null && this.remove([m]));
+        } else {
+          this.remove([m]);
+        }
+        break;
+    }
+  }
+
+  onBulk(e: JtGridBulkEvent<Message>): void {
+    const action = e.action;
+    if (action.startsWith('move:')) {
+      const target = this.state.folder(Number(action.slice(5)));
+      this.runBulk(e.rows, 'To ' + (target ? folderLabel(target) : 'folder'), m => this.api.updateMessage(m.id, { folderId: target!.id }));
+      return;
+    }
+    switch (action) {
+      case 'read': this.runBulk(e.rows, 'Mark read', m => this.api.updateMessage(m.id, { read: true })); break;
+      case 'unread': this.runBulk(e.rows, 'Mark unread', m => this.api.updateMessage(m.id, { read: false })); break;
+      case 'flag': this.runBulk(e.rows, 'Flag', m => this.api.updateMessage(m.id, { flagged: true })); break;
+      case 'delete':
+        this.runBulk(e.rows, this.kind() === 'Trash' ? 'Delete forever' : 'Delete', m => this.api.deleteMessage(m.id),
+          this.kind() === 'Trash' ? `Delete ${e.rows.length} messages forever? They cannot be restored.` : `Move ${e.rows.length} messages to the Trash?`);
+        break;
+    }
+  }
+
+  empty(): void {
+    const folder = this.folder();
+    if (!folder) return;
+    this.dialogs.confirm(`Empty ${this.title()}?`, `All ${this.messages().length} messages are deleted forever.`, 'Empty', true)
+      .subscribe(ok => {
+        if (ok === null) return;
+        this.api.emptyFolder(folder.id).subscribe({
+          next: r => { this.toasts.ok(`${r.deleted} messages deleted`); this.afterChange(); },
+          error: e => this.toasts.error(errorText(e))
+        });
+      });
+  }
+
+  private runBulk(rows: Message[], label: string, run: (m: Message) => Observable<unknown>, confirm?: string): void {
+    this.bulk.run({ rows, label, confirm, danger: !!confirm, run }).subscribe(() => this.afterChange());
+  }
+
+  private moveTo(rows: Message[], folderId: number | undefined, done: string): void {
+    if (!folderId) return;
+    forkJoin(rows.map(m => this.api.updateMessage(m.id, { folderId }))).subscribe({
+      next: () => { this.toasts.ok(done); this.afterChange(); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  private remove(rows: Message[]): void {
+    forkJoin(rows.length ? rows.map(m => this.api.deleteMessage(m.id)) : [of(null)]).subscribe({
+      next: () => { this.toasts.ok(this.kind() === 'Trash' ? 'Deleted forever' : 'Moved to Trash'); this.afterChange(); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  private patch(m: Message, change: { read?: boolean; flagged?: boolean }): void {
+    this.api.updateMessage(m.id, change).subscribe({
+      next: updated => {
+        this.messages.update(list => list.map(x => x.id === m.id ? { ...x, read: updated.read, flagged: updated.flagged } : x));
+        if (change.read !== undefined) this.state.refreshFolders();
+      },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  private afterChange(): void {
+    this.load(true);
+    this.state.refreshFolders();
+    this.state.refreshProfile();
+  }
+}

frontend/src/app/pages/inbox-redirect.ts

@@ -0,0 +1,25 @@
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { Router } from '@angular/router';
+import { ApiService } from '../core/api.service';
+import { errorText } from '../core/models';
+
+/** "/" → the Inbox (its id is per user). */
+@Component({
+  selector: 'app-inbox-redirect',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `<section class="glass-panel static p-6 text-slate-400 font-mono text-sm">{{ message }}</section>`
+})
+export class InboxRedirect {
+  message = 'Loading…';
+
+  constructor() {
+    const router = inject(Router);
+    inject(ApiService).folders().subscribe({
+      next: folders => {
+        const inbox = folders.find(f => f.system && f.name === 'INBOX') ?? folders[0];
+        if (inbox) router.navigate(['/folder', inbox.id], { replaceUrl: true });
+      },
+      error: e => { this.message = errorText(e); }
+    });
+  }
+}

frontend/src/app/pages/message/message.page.ts

@@ -0,0 +1,274 @@
+import { ChangeDetectionStrategy, Component, computed, effect, inject, input, signal } from '@angular/core';
+import { DatePipe } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
+import { Location } from '@angular/common';
+import { Router, RouterLink } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { MatTooltipModule } from '@angular/material/tooltip';
+import { ApiService } from '../../core/api.service';
+import { MailStateService } from '../../core/mail-state.service';
+import { Attachment, Message, errorText, folderLabel, formatBytes } from '../../core/models';
+import { DialogService } from '../../ui/dialog.service';
+import { ToastService } from '../../ui/toast.service';
+
+/** One message: headers, body, attachments, reply/forward/move/spam/block/delete. */
+@Component({
+  selector: 'app-message',
+  imports: [DatePipe, FormsModule, RouterLink, MatIconModule, MatTooltipModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    @if (error()) {
+      <section class="glass-panel static p-6">
+        <p class="text-pink-400 font-rajdhani mb-4" role="alert">{{ error() }}</p>
+        <a routerLink="/" class="ghost-btn"><mat-icon>arrow_back</mat-icon> Inbox</a>
+      </section>
+    } @else if (message(); as m) {
+      <article class="glass-panel static p-4 md:p-6" aria-labelledby="message-subject">
+        <div class="flex flex-wrap items-center gap-2 mb-5 pb-4 border-b border-cyan-500/20" role="toolbar" aria-label="Message actions">
+          <button type="button" class="ghost-btn" (click)="back()"><mat-icon>arrow_back</mat-icon> Back</button>
+          <span class="flex-grow"></span>
+          <a [routerLink]="['/compose', { reply: m.id }]" class="ghost-btn"><mat-icon>reply</mat-icon> Reply</a>
+          @if (hasOthers()) {
+            <a [routerLink]="['/compose', { replyAll: m.id }]" class="ghost-btn"><mat-icon>reply_all</mat-icon> Reply all</a>
+          }
+          <a [routerLink]="['/compose', { forward: m.id }]" class="ghost-btn"><mat-icon>forward</mat-icon> Forward</a>
+          <button type="button" class="ghost-btn" [attr.aria-pressed]="m.flagged" (click)="update({ flagged: !m.flagged })">
+            <mat-icon [class.text-yellow-400]="m.flagged">{{ m.flagged ? 'star' : 'star_border' }}</mat-icon> {{ m.flagged ? 'Flagged' : 'Flag' }}
+          </button>
+          <button type="button" class="ghost-btn" (click)="markUnread()"><mat-icon>mark_email_unread</mat-icon> Unread</button>
+          <label for="move-to" class="sr-only">Move to folder</label>
+          <select id="move-to" class="bg-slate-900/80 text-slate-300 border border-cyan-500/35 rounded-[10px] px-2 py-1.5 text-xs font-mono"
+                  [ngModel]="''" (ngModelChange)="move($event)">
+            <option value="" disabled>Move to…</option>
+            @for (f of targets(); track f.id) { <option [value]="f.id">{{ label(f) }}</option> }
+          </select>
+          @if (inSpam()) {
+            <button type="button" class="ghost-btn" (click)="notSpam()"><mat-icon>inbox</mat-icon> Not spam</button>
+          } @else if (!outgoing()) {
+            <button type="button" class="ghost-btn" (click)="spam()"><mat-icon>report</mat-icon> Spam</button>
+          }
+          <button type="button" class="ghost-btn danger" (click)="remove()"><mat-icon>delete</mat-icon> {{ inTrash() ? 'Delete forever' : 'Delete' }}</button>
+        </div>
+
+        <h1 id="message-subject" class="text-2xl font-orbitron font-bold neon-text-secondary mb-4 break-words">{{ m.subject || '(no subject)' }}</h1>
+
+        <div class="flex items-start gap-3 mb-5">
+          <div class="w-11 h-11 rounded-full bg-gradient-to-br from-pink-500/60 to-cyan-400/60 flex items-center justify-center font-orbitron font-bold text-white shrink-0"
+               aria-hidden="true">{{ initial() }}</div>
+          <dl class="text-sm font-rajdhani min-w-0 flex-grow grid grid-cols-[auto_1fr] gap-x-3 gap-y-0.5">
+            <dt class="text-slate-500 font-mono text-xs pt-0.5">From</dt>
+            <dd class="text-slate-100 break-all">
+              @if (m.senderName) { <span class="font-bold">{{ m.senderName }}</span> }
+              <span class="text-cyan-300 font-mono text-xs ml-1">&lt;{{ m.senderEmail }}&gt;</span>
+              @if (!outgoing()) {
+                <button type="button" class="ml-2 text-[11px] font-mono text-slate-500 hover:text-pink-400" (click)="block()">block sender</button>
+              }
+            </dd>
+            <dt class="text-slate-500 font-mono text-xs pt-0.5">To</dt>
+            <dd class="text-slate-300 break-all">{{ m.recipientEmail }}</dd>
+            @if (m.ccEmail) {
+              <dt class="text-slate-500 font-mono text-xs pt-0.5">Cc</dt>
+              <dd class="text-slate-300 break-all">{{ m.ccEmail }}</dd>
+            }
+            <dt class="text-slate-500 font-mono text-xs pt-0.5">Date</dt>
+            <dd class="text-slate-400 font-mono text-xs pt-0.5">{{ m.receivedAt | date: 'EEEE, d MMMM y, HH:mm' }}</dd>
+          </dl>
+        </div>
+
+        @if (m.spam) {
+          <p class="mb-4 px-3 py-2 rounded-lg bg-pink-500/15 border border-pink-500/40 text-pink-200 text-sm font-rajdhani flex items-center gap-2">
+            <mat-icon>report</mat-icon> Marked as spam: the sender is blocked or the message failed the SPF/DKIM/DMARC checks.
+          </p>
+        }
+
+        @if (m.html) {
+          <div class="flex items-center gap-3 mb-2 text-xs font-mono text-slate-400">
+            <span>HTML message</span>
+            <button type="button" class="ghost-btn !py-1" (click)="remoteImages.set(!remoteImages())" [attr.aria-pressed]="remoteImages()">
+              <mat-icon>image</mat-icon> {{ remoteImages() ? 'Hide remote images' : 'Show remote images' }}
+            </button>
+          </div>
+          <iframe class="w-full h-[65vh] rounded-xl bg-white border border-cyan-500/30" sandbox="allow-popups allow-popups-to-escape-sandbox"
+                  [srcdoc]="htmlDoc()" title="Message body"></iframe>
+        } @else {
+          <div class="bg-slate-950/70 rounded-xl border border-cyan-500/20 p-4 md:p-5 font-rajdhani text-[1.02rem] text-slate-200 whitespace-pre-wrap break-words leading-relaxed">{{ m.body }}</div>
+        }
+
+        @if (attachments().length) {
+          <h2 class="mt-6 mb-2 text-xs font-orbitron font-bold text-cyan-300 tracking-widest">ATTACHMENTS ({{ attachments().length }})</h2>
+          <ul class="flex flex-wrap gap-2">
+            @for (a of attachments(); track a.id) {
+              <li>
+                <button type="button" class="ghost-btn !py-2" (click)="download(a)" [attr.aria-label]="'Download ' + a.filename">
+                  <mat-icon>{{ fileIcon(a) }}</mat-icon>
+                  <span class="max-w-[220px] truncate text-slate-200">{{ a.filename }}</span>
+                  <span class="text-slate-500">{{ size(a.sizeBytes) }}</span>
+                  <mat-icon class="text-cyan-300">download</mat-icon>
+                </button>
+              </li>
+            }
+          </ul>
+        }
+      </article>
+    } @else {
+      <section class="glass-panel static p-6 text-slate-400 font-mono text-sm">Loading…</section>
+    }
+  `
+})
+export class MessagePage {
+  readonly id = input.required<string>();
+
+  private api = inject(ApiService);
+  private state = inject(MailStateService);
+  private dialogs = inject(DialogService);
+  private toasts = inject(ToastService);
+  private router = inject(Router);
+  private location = inject(Location);
+  private sanitizer = inject(DomSanitizer);
+
+  readonly message = signal<Message | null>(null);
+  readonly attachments = signal<Attachment[]>([]);
+  readonly error = signal('');
+  readonly remoteImages = signal(false);
+
+  readonly folder = computed(() => { const m = this.message(); return m ? this.state.folder(m.folderId) : null; });
+  readonly inTrash = computed(() => this.folder()?.system === true && this.folder()?.name === 'Trash');
+  readonly inSpam = computed(() => this.folder()?.system === true && this.folder()?.name === 'Spam');
+  readonly outgoing = computed(() => this.folder()?.system === true && ['Sent', 'Drafts'].includes(this.folder()!.name));
+  readonly targets = computed(() => this.state.folders().filter(f => f.id !== this.message()?.folderId && f.name !== 'Drafts'));
+  readonly initial = computed(() => (this.message()?.senderName || this.message()?.senderEmail || '?').trim().charAt(0).toUpperCase());
+  readonly hasOthers = computed(() => {
+    const m = this.message();
+    if (!m) return false;
+    return m.recipientEmail.split(',').length + (m.ccEmail ? m.ccEmail.split(',').length : 0) > 1;
+  });
+
+  /** No scripts (sandbox), remote content only when asked — a sender cannot see that the message was opened. */
+  readonly htmlDoc = computed<SafeHtml>(() => {
+    const img = this.remoteImages() ? 'img-src data: https: http:;' : 'img-src data:;';
+    const csp = `<meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src 'unsafe-inline'; ${img} font-src data:">`;
+    const base = '<base target="_blank"><style>body{font-family:system-ui,sans-serif;margin:16px;color:#111;word-wrap:break-word}</style>';
+    return this.sanitizer.bypassSecurityTrustHtml(csp + base + (this.message()?.body ?? ''));
+  });
+
+  label = folderLabel;
+
+  constructor() {
+    effect(() => this.load(Number(this.id())));
+  }
+
+  private load(id: number): void {
+    this.message.set(null);
+    this.attachments.set([]);
+    this.error.set('');
+    this.remoteImages.set(false);
+    this.api.message(id).subscribe({
+      next: m => {
+        this.message.set(m);
+        if (m.attachmentCount) this.api.attachments(m.id).subscribe({ next: a => this.attachments.set(a), error: () => {} });
+        if (!m.read) {
+          this.api.updateMessage(m.id, { read: true }).subscribe({
+            next: () => { this.message.update(x => x && { ...x, read: true }); this.state.refreshFolders(); },
+            error: () => {}
+          });
+        }
+      },
+      error: e => this.error.set(e?.status === 404 ? 'This message does not exist (or was deleted).' : errorText(e))
+    });
+  }
+
+  back(): void {
+    const m = this.message();
+    if (history.length > 1) this.location.back();
+    else this.router.navigate(m ? ['/folder', m.folderId] : ['/']);
+  }
+
+  update(change: { read?: boolean; flagged?: boolean; folderId?: number }): void {
+    const m = this.message();
+    if (!m) return;
+    this.api.updateMessage(m.id, change).subscribe({
+      next: updated => { this.message.set({ ...m, ...updated, body: m.body }); this.state.refreshFolders(); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  markUnread(): void {
+    const m = this.message();
+    if (!m) return;
+    this.api.updateMessage(m.id, { read: false }).subscribe({
+      next: () => { this.state.refreshFolders(); this.router.navigate(['/folder', m.folderId]); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  move(value: string): void {
+    const target = this.state.folder(Number(value));
+    const m = this.message();
+    if (!target || !m) return;
+    this.api.updateMessage(m.id, { folderId: target.id }).subscribe({
+      next: () => { this.toasts.ok(`Moved to ${folderLabel(target)}`); this.state.refreshFolders(); this.router.navigate(['/folder', m.folderId]); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  spam(): void { const s = this.state.system('Spam'); if (s) this.move(String(s.id)); }
+  notSpam(): void { const i = this.state.inbox(); if (i) this.move(String(i.id)); }
+
+  block(): void {
+    const m = this.message();
+    if (!m) return;
+    this.dialogs.confirm(`Block ${m.senderEmail}?`, 'New messages from this sender go straight to Spam. This message moves to Spam too.', 'Block', true)
+      .subscribe(ok => {
+        if (ok === null) return;
+        this.api.block(m.senderEmail, 'Blocked from a message').subscribe({
+          next: () => { this.toasts.ok(`${m.senderEmail} blocked`); this.spam(); },
+          error: e => this.toasts.error(errorText(e))
+        });
+      });
+  }
+
+  remove(): void {
+    const m = this.message();
+    if (!m) return;
+    const go = () => this.api.deleteMessage(m.id).subscribe({
+      next: () => {
+        this.toasts.ok(this.inTrash() ? 'Deleted forever' : 'Moved to Trash');
+        this.state.refreshFolders();
+        this.state.refreshProfile();
+        this.router.navigate(['/folder', m.folderId]);
+      },
+      error: e => this.toasts.error(errorText(e))
+    });
+    if (this.inTrash()) {
+      this.dialogs.confirm('Delete forever?', 'This message cannot be restored.', 'Delete', true).subscribe(ok => ok !== null && go());
+    } else {
+      go();
+    }
+  }
+
+  download(a: Attachment): void {
+    this.api.download(a.id).subscribe({
+      next: blob => {
+        const url = URL.createObjectURL(blob);
+        const link = document.createElement('a');
+        link.href = url;
+        link.download = a.filename;
+        link.click();
+        setTimeout(() => URL.revokeObjectURL(url), 1000);
+      },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  size(bytes: number): string { return formatBytes(bytes); }
+
+  fileIcon(a: Attachment): string {
+    const type = a.contentType || '';
+    if (type.startsWith('image/')) return 'image';
+    if (type.includes('pdf')) return 'picture_as_pdf';
+    if (type.includes('zip') || type.includes('compressed')) return 'folder_zip';
+    if (type.startsWith('text/')) return 'description';
+    return 'attach_file';
+  }
+}

frontend/src/app/pages/settings/mailboxes.section.ts

@@ -0,0 +1,162 @@
+import { ChangeDetectionStrategy, Component, computed, inject, signal } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { MatIconModule } from '@angular/material/icon';
+import { ApiService } from '../../core/api.service';
+import { MailStateService } from '../../core/mail-state.service';
+import { Mailbox, errorText, formatBytes } from '../../core/models';
+import { ToastService } from '../../ui/toast.service';
+import { AuthService } from '../../core/auth.service';
+
+/** Settings → Mailboxes (administrators): create no-reply@, monitor@, support@ …, new password, switch off. */
+@Component({
+  selector: 'app-mailboxes-section',
+  imports: [FormsModule, MatIconModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <section class="glass-panel static p-5 md:p-6 xl:col-span-2" aria-labelledby="mailboxes-title">
+      <h2 id="mailboxes-title" class="text-lg font-orbitron font-bold text-cyan-300 flex items-center gap-2 mb-4 border-b border-cyan-500/20 pb-2">
+        <mat-icon class="text-pink-500">group</mat-icon> MAILBOXES
+      </h2>
+
+      <form (ngSubmit)="create()" class="grid grid-cols-1 md:grid-cols-[1fr_1fr_1fr_auto] gap-3 items-end mb-4">
+        <div><label class="synth-label" for="mb-email">Address</label>
+          <div class="flex items-stretch gap-2">
+            <input id="mb-email" name="email" class="synth-input" [ngModel]="local()" (ngModelChange)="local.set($event.toLowerCase().trim())"
+                   placeholder="no-reply" autocomplete="off" required>
+            <span class="flex items-center text-cyan-300 font-mono">&#64;</span>
+            @if (domains().length > 1) {
+              <select name="domain" class="synth-input !w-auto" [ngModel]="domain()" (ngModelChange)="domain.set($event)" aria-label="Domain">
+                @for (d of domains(); track d) { <option [value]="d">{{ d }}</option> }
+              </select>
+            } @else {
+              <span class="flex items-center px-3 rounded-[10px] bg-slate-900/70 border border-cyan-500/30 font-mono text-sm text-slate-200 whitespace-nowrap">{{ domain() }}</span>
+            }
+          </div></div>
+        <div><label class="synth-label" for="mb-name">Name</label>
+          <input id="mb-name" name="name" class="synth-input" [(ngModel)]="name" maxlength="100" autocomplete="off"></div>
+        <div><label class="synth-label" for="mb-password">Password (empty — generate)</label>
+          <div class="relative"><input id="mb-password" name="password" [type]="showPw() ? 'text' : 'password'" class="synth-input pr-10" [(ngModel)]="password" autocomplete="new-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="showPw() ? 'Hide password' : 'Show password'" (click)="showPw.set(!showPw())">
+              <mat-icon>{{ showPw() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button></div></div>
+        <button type="submit" class="cyber-btn px-4 py-2 rounded-lg text-xs font-bold" [disabled]="busy()"><mat-icon>add</mat-icon> CREATE</button>
+      </form>
+      @if (error()) { <p class="text-sm text-pink-400 mb-3" role="alert">{{ error() }}</p> }
+
+      @if (secret(); as s) {
+        <div class="p-3 mb-4 rounded-lg border border-pink-500/40 bg-slate-900/60" role="status">
+          <div class="text-xs text-slate-400 mb-1">Password of <span class="font-mono text-cyan-300">{{ s.email }}</span> — shown once, copy it now</div>
+          <div class="flex items-center gap-2">
+            <code class="font-mono text-pink-300 break-all select-all">{{ s.password }}</code>
+            <button type="button" class="ghost-btn !py-1" (click)="copy(s.password)" aria-label="Copy password"><mat-icon>content_copy</mat-icon></button>
+            <button type="button" class="ghost-btn !py-1" (click)="secret.set(null)" aria-label="Hide password"><mat-icon>close</mat-icon></button>
+          </div>
+        </div>
+      }
+
+      <ul class="divide-y divide-cyan-500/10">
+        @for (m of mailboxes(); track m.id) {
+          <li class="flex flex-wrap items-center gap-x-4 gap-y-1 py-2">
+            <span class="font-mono text-sm" [class.text-cyan-300]="m.active" [class.text-slate-500]="!m.active" [class.line-through]="!m.active">{{ m.email }}</span>
+            <span class="text-sm text-slate-400">{{ m.displayName }}</span>
+            @if (m.admin) { <span class="text-[10px] font-mono px-1.5 rounded border border-pink-500/40 text-pink-300">ADMIN</span> }
+            <span class="text-xs font-mono text-slate-500 ml-auto">{{ size(m.usedBytes) }}</span>
+            @if (m.email !== me()) {
+              <button type="button" class="ghost-btn !py-1" (click)="open(m)" [attr.aria-label]="'Open ' + m.email" title="Open mailbox">
+                <mat-icon>mark_email_read</mat-icon> OPEN</button>
+            }
+            <button type="button" class="ghost-btn !py-1" (click)="newPassword(m)" [attr.aria-label]="'New password for ' + m.email"><mat-icon>key</mat-icon></button>
+            @if (m.email !== me()) {
+              <button type="button" class="ghost-btn !py-1" (click)="toggle(m)"
+                      [attr.aria-label]="(m.active ? 'Switch off ' : 'Switch on ') + m.email">
+                <mat-icon>{{ m.active ? 'toggle_on' : 'toggle_off' }}</mat-icon></button>
+            }
+          </li>
+        }
+      </ul>
+    </section>
+  `
+})
+export class MailboxesSection {
+  private api = inject(ApiService);
+  private state = inject(MailStateService);
+  private toasts = inject(ToastService);
+  private auth = inject(AuthService);
+
+  readonly mailboxes = signal<Mailbox[]>([]);
+  readonly secret = signal<{ email: string; password: string } | null>(null);
+  readonly error = signal('');
+  readonly busy = signal(false);
+  readonly me = computed(() => this.state.profile()?.email ?? '');
+  readonly showPw = signal(false);
+  readonly local = signal('');
+  // Домены сервера (/api/config); пока не пришли — домен своего ящика
+  readonly domains = signal<string[]>([]);
+  readonly domain = signal('');
+  name = '';
+  password = '';
+
+  constructor() {
+    this.domain.set(this.me().split('@')[1] ?? '');
+    this.api.config().subscribe({
+      next: c => { this.domains.set(c.domains); if (!c.domains.includes(this.domain())) { this.domain.set(c.domains[0] ?? ''); } },
+      error: () => {}
+    });
+    this.load();
+  }
+
+  size(bytes: number): string {
+    return formatBytes(bytes);
+  }
+
+  load(): void {
+    this.api.mailboxes().subscribe({ next: list => this.mailboxes.set(list), error: e => this.error.set(errorText(e)) });
+  }
+
+  create(): void {
+    const local = this.local().replace(/@.*$/, '');
+    if (!local) { this.error.set('Enter an address'); return; }
+    const email = local + '@' + this.domain();
+    this.error.set('');
+    this.busy.set(true);
+    this.api.createMailbox(email, this.name.trim(), this.password).subscribe({
+      next: created => {
+        this.busy.set(false);
+        this.local.set('');
+        this.name = this.password = '';
+        if (created.password) { this.secret.set({ email: created.mailbox.email, password: created.password }); }
+        this.toasts.ok('Mailbox ' + created.mailbox.email + ' created');
+        this.load();
+      },
+      error: e => { this.busy.set(false); this.error.set(errorText(e)); }
+    });
+  }
+
+  newPassword(m: Mailbox): void {
+    if (!confirm('New password for ' + m.email + '? The old one stops working at once.')) return;
+    this.api.newMailboxPassword(m.id).subscribe({
+      next: created => created.password && this.secret.set({ email: m.email, password: created.password }),
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  /** Administrator reads this mailbox: its session; the banner on top leads back. Full reload — fresh folders. */
+  open(m: Mailbox): void {
+    this.api.openMailbox(m.id).subscribe({
+      next: session => { this.auth.openAs(session); location.assign('/'); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  toggle(m: Mailbox): void {
+    this.api.setMailboxActive(m.id, !m.active).subscribe({
+      next: () => this.load(),
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  copy(text: string): void {
+    navigator.clipboard?.writeText(text).then(() => this.toasts.ok('Copied'), () => this.toasts.error('Copy it by hand'));
+  }
+}

frontend/src/app/pages/settings/settings.page.ts

@@ -0,0 +1,170 @@
+import { ChangeDetectionStrategy, Component, computed, effect, inject, signal } from '@angular/core';
+import { DatePipe } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { MatIconModule } from '@angular/material/icon';
+import { ApiService } from '../../core/api.service';
+import { MailStateService } from '../../core/mail-state.service';
+import { errorText, formatBytes } from '../../core/models';
+import { THEMES, ThemeService } from '../../ui/theme.service';
+import { ToastService } from '../../ui/toast.service';
+import { MailboxesSection } from './mailboxes.section';
+
+/** Profile name, password, storage, look. */
+@Component({
+  selector: 'app-settings',
+  imports: [DatePipe, FormsModule, MatIconModule, MailboxesSection],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="grid grid-cols-1 xl:grid-cols-2 gap-5">
+      <section class="glass-panel static p-5 md:p-6" aria-labelledby="profile-title">
+        <h1 id="profile-title" class="text-lg font-orbitron font-bold text-cyan-300 flex items-center gap-2 mb-4 border-b border-cyan-500/20 pb-2">
+          <mat-icon class="text-pink-500">badge</mat-icon> PROFILE
+        </h1>
+        @if (state.profile(); as p) {
+          <dl class="text-sm font-rajdhani grid grid-cols-[auto_1fr] gap-x-4 gap-y-1 mb-5">
+            <dt class="text-slate-500 font-mono text-xs pt-0.5">Mailbox</dt><dd class="text-cyan-300 font-mono">{{ p.email }}</dd>
+            <dt class="text-slate-500 font-mono text-xs pt-0.5">Since</dt><dd class="text-slate-300">{{ p.createdAt | date: 'd MMMM y' }}</dd>
+          </dl>
+        }
+        <form (ngSubmit)="saveName()" class="space-y-3">
+          <div>
+            <label class="synth-label" for="display-name">Name shown to recipients</label>
+            <input id="display-name" name="displayName" class="synth-input" [(ngModel)]="displayName" maxlength="100" required>
+          </div>
+          <button type="submit" class="cyber-btn px-4 py-2 rounded-lg text-xs font-bold"><mat-icon>save</mat-icon> SAVE NAME</button>
+        </form>
+      </section>
+
+      <section class="glass-panel static p-5 md:p-6" aria-labelledby="password-title">
+        <h2 id="password-title" class="text-lg font-orbitron font-bold text-cyan-300 flex items-center gap-2 mb-4 border-b border-cyan-500/20 pb-2">
+          <mat-icon class="text-pink-500">key</mat-icon> PASSWORD
+        </h2>
+        <form (ngSubmit)="changePassword()" class="space-y-3">
+          <input type="email" name="username" class="sr-only" [value]="state.profile()?.email ?? ''" autocomplete="username" tabindex="-1" aria-hidden="true">
+          <div><label class="synth-label" for="pw-current">Current password</label>
+            <div class="relative"><input id="pw-current" name="current" [type]="showPw() ? 'text' : 'password'" class="synth-input pr-10" [(ngModel)]="current" autocomplete="current-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="showPw() ? 'Hide password' : 'Show password'" (click)="showPw.set(!showPw())">
+              <mat-icon>{{ showPw() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button></div></div>
+          <div><label class="synth-label" for="pw-new">New password (8+ characters)</label>
+            <div class="relative"><input id="pw-new" name="next" [type]="showPw() ? 'text' : 'password'" class="synth-input pr-10" [(ngModel)]="next" autocomplete="new-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="showPw() ? 'Hide password' : 'Show password'" (click)="showPw.set(!showPw())">
+              <mat-icon>{{ showPw() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button></div></div>
+          <div><label class="synth-label" for="pw-again">New password again</label>
+            <div class="relative"><input id="pw-again" name="again" [type]="showPw() ? 'text' : 'password'" class="synth-input pr-10" [(ngModel)]="again" autocomplete="new-password">
+            <button type="button" class="absolute right-2 top-1/2 -translate-y-1/2 text-slate-400 hover:text-cyan-300"
+                    [attr.aria-label]="showPw() ? 'Hide password' : 'Show password'" (click)="showPw.set(!showPw())">
+              <mat-icon>{{ showPw() ? 'visibility_off' : 'visibility' }}</mat-icon>
+            </button></div></div>
+          @if (passwordError()) { <p class="text-sm text-pink-400" role="alert">{{ passwordError() }}</p> }
+          <button type="submit" class="cyber-btn px-4 py-2 rounded-lg text-xs font-bold"><mat-icon>lock_reset</mat-icon> CHANGE PASSWORD</button>
+        </form>
+      </section>
+
+      <section class="glass-panel static p-5 md:p-6" aria-labelledby="storage-title">
+        <h2 id="storage-title" class="text-lg font-orbitron font-bold text-cyan-300 flex items-center gap-2 mb-4 border-b border-cyan-500/20 pb-2">
+          <mat-icon class="text-pink-500">storage</mat-icon> STORAGE
+        </h2>
+        <div class="flex justify-between text-xs font-mono text-slate-300 mb-1">
+          <span>{{ used() }} of {{ quota() }}</span><span class="text-pink-400">{{ percent() }}%</span>
+        </div>
+        <div class="h-2 rounded-full bg-slate-800 overflow-hidden mb-4" role="progressbar" aria-label="Storage used"
+             [attr.aria-valuenow]="percent()" aria-valuemin="0" aria-valuemax="100">
+          <div class="h-full bg-gradient-to-r from-cyan-400 to-pink-500" [style.width.%]="percent()"></div>
+        </div>
+        <ul class="text-sm font-rajdhani text-slate-300 space-y-1">
+          @for (f of state.folders(); track f.id) {
+            <li class="flex justify-between"><span>{{ f.system ? label(f.name) : f.name }}</span>
+              <span class="font-mono text-xs text-slate-400">{{ f.messageCount }} messages</span></li>
+          }
+        </ul>
+      </section>
+
+      <section class="glass-panel static p-5 md:p-6" aria-labelledby="look-title">
+        <h2 id="look-title" class="text-lg font-orbitron font-bold text-cyan-300 flex items-center gap-2 mb-4 border-b border-cyan-500/20 pb-2">
+          <mat-icon class="text-pink-500">palette</mat-icon> LOOK
+        </h2>
+        <fieldset class="mb-4">
+          <legend class="synth-label">Palette</legend>
+          <div class="grid grid-cols-2 gap-2">
+            @for (t of themes; track t.value) {
+              <button type="button" class="ghost-btn justify-center !py-2" [attr.aria-pressed]="theme.theme() === t.value"
+                      [class.!border-pink-500]="theme.theme() === t.value" [class.!text-pink-300]="theme.theme() === t.value"
+                      (click)="theme.theme.set(t.value)">{{ t.label }}</button>
+            }
+          </div>
+        </fieldset>
+        <div class="space-y-3">
+          <div class="flex items-center justify-between p-3 bg-slate-900/50 rounded-lg border border-pink-500/20">
+            <div><div class="font-bold text-slate-200">High contrast</div><div class="text-xs text-slate-400">Black background, bright outlines</div></div>
+            <button type="button" class="ghost-btn" [attr.aria-pressed]="theme.highContrast()" (click)="theme.highContrast.set(!theme.highContrast())">
+              {{ theme.highContrast() ? 'ON' : 'OFF' }}</button>
+          </div>
+          <div class="flex items-center justify-between p-3 bg-slate-900/50 rounded-lg border border-pink-500/20">
+            <div><div class="font-bold text-slate-200">Grid motion</div><div class="text-xs text-slate-400">The moving retro floor in the background</div></div>
+            <button type="button" class="ghost-btn" [attr.aria-pressed]="theme.animation()" (click)="theme.animation.set(!theme.animation())">
+              {{ theme.animation() ? 'ON' : 'OFF' }}</button>
+          </div>
+        </div>
+      </section>
+
+      @if (state.profile()?.admin) {
+        <app-mailboxes-section />
+      }
+    </div>
+  `
+})
+export class SettingsPage {
+  readonly state = inject(MailStateService);
+  readonly theme = inject(ThemeService);
+  private api = inject(ApiService);
+  private toasts = inject(ToastService);
+
+  readonly themes = THEMES;
+  displayName = '';
+  current = '';
+  next = '';
+  again = '';
+  readonly passwordError = signal('');
+  readonly showPw = signal(false);
+
+  readonly used = computed(() => formatBytes(this.state.profile()?.usedBytes));
+  readonly quota = computed(() => formatBytes(this.state.profile()?.quotaBytes));
+  readonly percent = computed(() => {
+    const p = this.state.profile();
+    return p && p.quotaBytes ? Math.min(100, Math.round(p.usedBytes / p.quotaBytes * 1000) / 10) : 0;
+  });
+
+  constructor() {
+    this.state.refreshProfile();
+    effect(() => { this.displayName = this.state.profile()?.displayName ?? ''; });
+  }
+
+  label(name: string): string {
+    return ({ INBOX: 'Inbox', Drafts: 'Drafts', Sent: 'Sent', Spam: 'Spam', Trash: 'Trash' } as Record<string, string>)[name] ?? name;
+  }
+
+  saveName(): void {
+    const name = this.displayName.trim();
+    if (!name) { this.toasts.error('The name cannot be empty'); return; }
+    this.api.updateMe(name).subscribe({
+      next: p => { this.state.profile.set(p); this.toasts.ok('Name saved'); },
+      error: e => this.toasts.error(errorText(e))
+    });
+  }
+
+  changePassword(): void {
+    const problem = !this.current ? 'Enter the current password'
+      : this.next.length < 8 ? 'The new password is shorter than 8 characters'
+      : this.next !== this.again ? 'The new passwords do not match' : '';
+    this.passwordError.set(problem);
+    if (problem) return;
+    this.api.changePassword(this.current, this.next).subscribe({
+      next: () => { this.current = this.next = this.again = ''; this.toasts.ok('Password changed'); },
+      error: e => this.passwordError.set(errorText(e))
+    });
+  }
+}

frontend/src/app/pages/shell/shell.component.ts

@@ -0,0 +1,268 @@
+import { ChangeDetectionStrategy, Component, DestroyRef, computed, inject, signal } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { NavigationEnd, Router, RouterLink, RouterLinkActive, RouterOutlet } from '@angular/router';
+import { MatIconModule } from '@angular/material/icon';
+import { MatTooltipModule } from '@angular/material/tooltip';
+import { JtRowActionsComponent, RowAction } from '@jambotron/aria-grid';
+import { filter } from 'rxjs';
+import { ApiService } from '../../core/api.service';
+import { AuthService } from '../../core/auth.service';
+import { MailStateService } from '../../core/mail-state.service';
+import { Folder, errorText, folderIcon, folderLabel, formatBytes } from '../../core/models';
+import { BackgroundComponent } from '../../ui/background.component';
+import { DialogService } from '../../ui/dialog.service';
+import { THEMES, ThemeService } from '../../ui/theme.service';
+import { ToastService } from '../../ui/toast.service';
+
+/** Header, folders sidebar and the page — everything after login. */
+@Component({
+  selector: 'app-shell',
+  imports: [FormsModule, RouterOutlet, RouterLink, RouterLinkActive, MatIconModule, MatTooltipModule,
+    JtRowActionsComponent, BackgroundComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <app-background />
+    <div class="relative z-10 flex flex-col min-h-screen">
+      <header class="px-4 py-3 lg:px-6 border-b border-cyan-500/20 glass-panel static rounded-none border-t-0 border-x-0 sticky top-0 z-40 backdrop-blur-xl">
+        <div class="max-w-[1500px] mx-auto flex items-center gap-3">
+          <button type="button" class="lg:hidden ghost-btn !px-2" aria-label="Folders" [attr.aria-expanded]="menuOpen()"
+                  (click)="menuOpen.set(!menuOpen())"><mat-icon>menu</mat-icon></button>
+          <a routerLink="/" class="flex items-center gap-3 shrink-0" aria-label="Synth Mail — inbox">
+            <div class="w-10 h-10 rounded-lg bg-gradient-to-br from-pink-500 to-cyan-400 flex items-center justify-center
+                        text-slate-950 font-black text-xl shadow-[0_0_15px_rgba(255,0,127,0.8)] font-orbitron">M</div>
+            <div class="hidden sm:block">
+              <div class="text-xl font-extrabold font-orbitron tracking-wider neon-text-primary leading-tight">
+                SYNTH <span class="text-cyan-400 font-normal">MAIL</span>
+              </div>
+              <div class="text-[10px] text-cyan-300/70 font-mono tracking-widest uppercase">Reactive mail server</div>
+            </div>
+          </a>
+
+          <form class="flex-grow max-w-xl mx-auto" role="search" (ngSubmit)="search()">
+            <label for="global-search" class="sr-only">Search in the current folder</label>
+            <div class="relative">
+              <mat-icon class="absolute left-3 top-1/2 -translate-y-1/2 text-cyan-400/70 !text-xl">search</mat-icon>
+              <input id="global-search" name="q" [(ngModel)]="query" placeholder="Search mail…"
+                     class="synth-input !pl-10 !rounded-full !py-2">
+            </div>
+          </form>
+
+          <div class="hidden md:flex items-center gap-3 bg-slate-950/60 px-4 py-1.5 rounded-full border border-pink-500/30 text-xs font-mono">
+            <span class="w-2 h-2 rounded-full bg-emerald-400 animate-ping" aria-hidden="true"></span>
+            <span class="text-slate-300">Unread: <span class="text-pink-400 font-bold">{{ state.unreadTotal() }}</span></span>
+            <span class="text-slate-600" aria-hidden="true">|</span>
+            <span class="text-cyan-300 max-w-[220px] truncate" [matTooltip]="auth.email() ?? ''">{{ state.profile()?.displayName || auth.email() }}</span>
+          </div>
+
+          <label for="palette" class="sr-only">Color theme</label>
+          <select id="palette" class="hidden xl:block bg-slate-900/90 text-cyan-300 border border-cyan-500/40 rounded-lg px-2 py-1.5 text-xs font-mono"
+                  [ngModel]="theme.theme()" (ngModelChange)="theme.theme.set($event)">
+            @for (t of themes; track t.value) { <option [value]="t.value">{{ t.label }}</option> }
+          </select>
+          <button type="button" class="ghost-btn !px-2" matTooltip="High contrast" aria-label="High contrast"
+                  [attr.aria-pressed]="theme.highContrast()" (click)="theme.highContrast.set(!theme.highContrast())">
+            <mat-icon class="text-yellow-400">contrast</mat-icon>
+          </button>
+          <button type="button" class="ghost-btn !px-2" matTooltip="Log out" aria-label="Log out" (click)="logout()">
+            <mat-icon>logout</mat-icon>
+          </button>
+        </div>
+      </header>
+
+      @if (auth.openedBy(); as admin) {
+        <div class="bg-pink-600/90 text-white text-sm font-rajdhani px-4 py-2 flex flex-wrap items-center justify-center gap-3" role="status">
+          <mat-icon class="!text-base">visibility</mat-icon>
+          <span>You are in mailbox <b class="font-mono">{{ auth.email() }}</b> as administrator</span>
+          <button type="button" class="ghost-btn !py-1 !border-white !text-white" (click)="backToAdmin()">
+            <mat-icon>arrow_back</mat-icon> Back to {{ admin }}</button>
+        </div>
+      }
+
+      <div class="flex-grow max-w-[1500px] w-full mx-auto p-3 md:p-5 grid grid-cols-1 lg:grid-cols-[260px_1fr] gap-5">
+        <nav class="glass-panel static p-4 md:pt-6 h-fit lg:sticky lg:top-20 lg:block" [class.hidden]="!menuOpen()"
+             aria-label="Mail folders">
+          <a routerLink="/compose" class="cyber-btn w-full py-2.5 rounded-xl font-bold text-xs mb-4" (click)="menuOpen.set(false)">
+            <mat-icon>edit</mat-icon> COMPOSE
+          </a>
+
+          <ul class="space-y-1">
+            @for (folder of systemFolders(); track folder.id) {
+              <li>
+                <a [routerLink]="['/folder', folder.id]" routerLinkActive="!bg-pink-500/20 !text-pink-300 !border-pink-500/40"
+                   class="flex items-center gap-3 px-3 py-2 rounded-lg border border-transparent text-slate-300 hover:bg-cyan-500/10 hover:text-cyan-300 font-rajdhani font-semibold"
+                   (click)="menuOpen.set(false)">
+                  <mat-icon class="!text-xl">{{ icon(folder) }}</mat-icon>
+                  <span class="flex-grow">{{ label(folder) }}</span>
+                  @if (badge(folder)) {
+                    <span class="text-[11px] font-mono px-2 rounded-full bg-pink-500/25 text-pink-300 border border-pink-500/40"
+                          [attr.aria-label]="badge(folder) + ' unread'">{{ badge(folder) }}</span>
+                  }
+                </a>
+              </li>
+            }
+          </ul>
+
+          <div class="flex items-center justify-between mt-5 mb-2 px-1">
+            <h2 class="text-[11px] font-orbitron font-bold text-cyan-300 tracking-widest">MY FOLDERS</h2>
+            <button type="button" class="text-slate-400 hover:text-cyan-300" matTooltip="New folder" aria-label="New folder"
+                    (click)="createFolder()"><mat-icon class="!text-xl">create_new_folder</mat-icon></button>
+          </div>
+          <ul class="space-y-1">
+            @for (folder of ownFolders(); track folder.id) {
+              <li class="flex items-center gap-1">
+                <a [routerLink]="['/folder', folder.id]" routerLinkActive="!bg-pink-500/20 !text-pink-300 !border-pink-500/40"
+                   class="flex-grow flex items-center gap-3 px-3 py-1.5 rounded-lg border border-transparent text-slate-300 hover:bg-cyan-500/10 hover:text-cyan-300 font-rajdhani font-semibold min-w-0"
+                   (click)="menuOpen.set(false)">
+                  <mat-icon class="!text-xl">folder</mat-icon>
+                  <span class="flex-grow truncate">{{ folder.name }}</span>
+                  @if (folder.unreadCount) {
+                    <span class="text-[11px] font-mono px-2 rounded-full bg-pink-500/25 text-pink-300">{{ folder.unreadCount }}</span>
+                  }
+                </a>
+                <jt-row-actions [actions]="folderActions" [subject]="folder.name" (action)="onFolderAction($event, folder)" />
+              </li>
+            } @empty {
+              <li class="px-3 text-xs text-slate-500 font-mono">No folders yet</li>
+            }
+          </ul>
+
+          <div class="border-t border-cyan-500/20 mt-5 pt-3 space-y-1">
+            @for (link of links; track link.path) {
+              <a [routerLink]="link.path" routerLinkActive="!text-pink-300"
+                 class="flex items-center gap-3 px-3 py-1.5 rounded-lg text-slate-400 hover:text-cyan-300 font-rajdhani font-semibold"
+                 (click)="menuOpen.set(false)">
+                <mat-icon class="!text-xl">{{ link.icon }}</mat-icon>{{ link.label }}
+              </a>
+            }
+          </div>
+
+          @if (state.profile(); as p) {
+            <div class="mt-4 px-1 text-[11px] font-mono text-slate-400">
+              <div class="flex justify-between mb-1"><span>Storage</span><span class="text-cyan-300">{{ used() }}</span></div>
+              <div class="h-1.5 rounded-full bg-slate-800 overflow-hidden" role="progressbar" aria-label="Storage used"
+                   [attr.aria-valuenow]="usedPercent()" aria-valuemin="0" aria-valuemax="100">
+                <div class="h-full bg-gradient-to-r from-cyan-400 to-pink-500" [style.width.%]="usedPercent()"></div>
+              </div>
+            </div>
+          }
+        </nav>
+
+        <main class="min-w-0" id="main">
+          <router-outlet />
+        </main>
+      </div>
+    </div>
+  `
+})
+export class ShellComponent {
+  readonly auth = inject(AuthService);
+  readonly state = inject(MailStateService);
+  readonly theme = inject(ThemeService);
+  private api = inject(ApiService);
+  private dialogs = inject(DialogService);
+  private toasts = inject(ToastService);
+  private router = inject(Router);
+
+  readonly themes = THEMES;
+  readonly menuOpen = signal(false);
+  query = '';
+
+  readonly links = [
+    { path: '/contacts', label: 'Contacts', icon: 'contacts' },
+    { path: '/blocked', label: 'Blocked senders', icon: 'block' },
+    { path: '/settings', label: 'Settings', icon: 'settings' }
+  ];
+
+  readonly folderActions: RowAction[] = [
+    { value: 'rename', label: 'Rename', icon: 'drive_file_rename_outline' },
+    { value: 'delete', label: 'Delete folder', icon: 'delete', danger: true }
+  ];
+
+  readonly systemFolders = computed(() => this.state.folders().filter(f => f.system));
+  readonly ownFolders = computed(() => this.state.folders().filter(f => !f.system));
+  readonly used = computed(() => {
+    const p = this.state.profile();
+    return p ? `${formatBytes(p.usedBytes)} / ${formatBytes(p.quotaBytes)}` : '';
+  });
+  readonly usedPercent = computed(() => {
+    const p = this.state.profile();
+    return p && p.quotaBytes ? Math.min(100, Math.round(p.usedBytes / p.quotaBytes * 100)) : 0;
+  });
+
+  label = folderLabel;
+  icon = folderIcon;
+
+  constructor() {
+    this.state.refreshFolders();
+    this.state.refreshProfile();
+    const timer = setInterval(() => this.state.refreshFolders(), 30000);
+    inject(DestroyRef).onDestroy(() => clearInterval(timer));
+    this.router.events.pipe(filter(e => e instanceof NavigationEnd)).subscribe(() => {
+      const q = this.router.parseUrl(this.router.url).queryParams['q'];
+      this.query = typeof q === 'string' ? q : '';
+    });
+  }
+
+  /** Drafts: how many; Sent, Trash: nothing; others: unread. */
+  badge(folder: Folder): number {
+    if (folder.name === 'Drafts') return folder.messageCount;
+    if (folder.name === 'Sent' || folder.name === 'Trash') return 0;
+    return folder.unreadCount;
+  }
+
+  search(): void {
+    const match = this.router.url.match(/^\/folder\/(\d+)/);
+    const folderId = match ? Number(match[1]) : this.state.inbox()?.id;
+    if (!folderId) return;
+    const q = this.query.trim();
+    this.router.navigate(['/folder', folderId], { queryParams: q ? { q } : {} });
+  }
+
+  createFolder(): void {
+    this.dialogs.prompt('New folder', 'Folder name', '', 'Create').subscribe(name => {
+      if (!name) return;
+      this.api.createFolder(name).subscribe({
+        next: folder => {
+          this.state.refreshFolders();
+          this.toasts.ok(`Folder "${folder.name}" created`);
+          this.router.navigate(['/folder', folder.id]);
+        },
+        error: e => this.toasts.error(errorText(e))
+      });
+    });
+  }
+
+  onFolderAction(action: string, folder: Folder): void {
+    if (action === 'rename') {
+      this.dialogs.prompt('Rename folder', 'Folder name', folder.name, 'Rename').subscribe(name => {
+        if (!name || name === folder.name) return;
+        this.api.renameFolder(folder.id, name).subscribe({
+          next: () => { this.state.refreshFolders(); this.toasts.ok('Folder renamed'); },
+          error: e => this.toasts.error(errorText(e))
+        });
+      });
+    } else if (action === 'delete') {
+      this.dialogs.confirm(`Delete "${folder.name}"?`, 'Its messages go to the Trash.', 'Delete', true).subscribe(ok => {
+        if (ok === null) return;
+        this.api.deleteFolder(folder.id).subscribe({
+          next: () => {
+            this.state.refreshFolders();
+            this.toasts.ok('Folder deleted');
+            if (this.router.url.startsWith(`/folder/${folder.id}`)) this.router.navigate(['/']);
+          },
+          error: e => this.toasts.error(errorText(e))
+        });
+      });
+    }
+  }
+
+  backToAdmin(): void {
+    this.auth.backToAdmin();
+    location.assign('/settings');
+  }
+
+  logout(): void {
+    this.state.reset();
+    this.auth.logout();
+  }
+}

frontend/src/app/services/auth.service.ts

@@ -1,57 +0,0 @@
-import { Injectable, inject } from '@angular/core';
-import { HttpClient } from '@angular/common/http';
-import { Observable, BehaviorSubject } from 'rxjs';
-import { tap, shareReplay } from 'rxjs/operators';
-import { LoginRequest, LoginResponse, RegisterRequest } from '../models/mail.models';
-
-@Injectable({
-  providedIn: 'root'
-})
-export class AuthService {
-  private http = inject(HttpClient);
-  private apiUrl = '/api';
-
-  private currentUserSubject = new BehaviorSubject<string | null>(
-    localStorage.getItem('email')
-  );
-  currentUser$ = this.currentUserSubject.asObservable();
-
-  private tokenSubject = new BehaviorSubject<string | null>(
-    localStorage.getItem('token')
-  );
-  token$ = this.tokenSubject.asObservable();
-
-  login({ email, password }: LoginRequest): Observable<LoginResponse> {
-    return this.http.post<LoginResponse>(`${this.apiUrl}/login`, { email, password }).pipe(
-      tap(({ token, email }) => {
-        localStorage.setItem('token', token);
-        localStorage.setItem('email', email);
-        this.tokenSubject.next(token);
-        this.currentUserSubject.next(email);
-      })
-    );
-  }
-
-  register({ email, password, displayName }: RegisterRequest): Observable<void> {
-    return this.http.post<void>(`${this.apiUrl}/register`, { email, password, displayName });
-  }
-
-  logout(): void {
-    localStorage.removeItem('token');
-    localStorage.removeItem('email');
-    this.tokenSubject.next(null);
-    this.currentUserSubject.next(null);
-  }
-
-  getToken(): string | null {
-    return localStorage.getItem('token');
-  }
-
-  isLoggedIn(): boolean {
-    return !!localStorage.getItem('token');
-  }
-
-  getEmail(): string | null {
-    return localStorage.getItem('email');
-  }
-}