docker-mailserver

dms/config/postfix-accounts.cf

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+knuth@andreasknuth.de|hashed_password_here  # Generiere Passwort mit: docker run --rm ghcr.io/docker-mailserver/docker-mailserver:latest generate-password

dms/docker-compose.yml

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+services:
+  mailserver:
+    image: ghcr.io/docker-mailserver/docker-mailserver:latest
+    container_name: dms-mailserver
+    hostname: mail.andreasknuth.de  # Passe an deine Haupt-Domain an
+    env_file: mailserver.env
+    ports:
+      - "2525:25"    # SMTP (extern auf 2525, um MailCow nicht zu stören)
+      - "1443:143"   # IMAP (extern auf 1443)
+      - "465:465"    # SMTPS
+      - "994:993"    # IMAPS (extern auf 994, um Konflikte zu vermeiden)
+      - "2587:587"   # Submission (extern auf 2587 für Lambda)
+    volumes:
+      - ./data/:/var/mail/
+      - ./state/:/var/mail-state/
+      - ./config/:/tmp/docker-mailserver/
+    environment:
+      - ENABLE_FAIL2BAN=1
+      - SSL_TYPE=letsencrypt  # Oder self-signed für Test
+      - PERMIT_DOCKER=host
+      - ONE_DIR=1
+    cap_add:
+      - NET_ADMIN
+    restart: always
+    networks:
+      - dms_network
+      - mail_network  # Verbinde mit deinem bestehenden mail_network für Caddy
+
+roundcube:
+  image: roundcube/roundcubemail:latest
+  container_name: dms-roundcube
+  environment:
+    - ROUNDCUBEMAIL_DEFAULT_HOST=mail.andreasknuth.de
+    - ROUNDCUBEMAIL_DEFAULT_PORT=1443  # Dein IMAP-Port
+    - ROUNDCUBEMAIL_SMTP_SERVER=mail.andreasknuth.de
+    - ROUNDCUBEMAIL_SMTP_PORT=2587
+    - ROUNDCUBEMAIL_PLUGINS=archive,zipdownload,managesieve,password  # Für Sieve (Auto-Reply/Forward), Password-Change
+  volumes:
+    - ./roundcube/:/var/roundcube/config/
+  ports:
+    - "9000:80"  # Intern auf 80, extern via Caddy
+  depends_on:
+    - mailserver
+  restart: always
+  networks:
+    - dms_network
+    - mail_network
+
+networks:
+  dms_network:
+    external: true
+  mail_network:
+    external: true

dms/mailserver.env

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+POSTMASTER_ADDRESS=postmaster@andreasknuth.de
+OVERRIDE_HOSTNAME=mail.andreasknuth.de
+DMS_DEBUG=1  # Für Logs
+ENABLE_RSPAMD=1  # Spam-Filter aktiv (Schritt 4)
+ENABLE_CLAMAV=1  # Optional: Virenscanner

dms/roundcube/config.inc.php

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+<?php
+
+/*
+ +-----------------------------------------------------------------------+
+ | Local configuration for the Roundcube Webmail installation.           |
+ |                                                                       |
+ | This is a sample configuration file only containing the minimum       |
+ | setup required for a functional installation. Copy more options       |
+ | from defaults.inc.php to this file to override the defaults.          |
+ |                                                                       |
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) The Roundcube Dev Team                                  |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ +-----------------------------------------------------------------------+
+*/
+
+$config = [];
+
+// Database connection string (DSN) for read+write operations
+// Format (compatible with PEAR MDB2): db_provider://user:password@host/database
+// Currently supported db_providers: mysql, pgsql, sqlite
+// For examples see http://pear.php.net/manual/en/package.database.mdb2.intro-dsn.php
+// NOTE: for SQLite use absolute path (Linux): 'sqlite:////full/path/to/sqlite.db?mode=0646'
+//       or (Windows): 'sqlite:///C:/full/path/to/sqlite.db'
+$config['db_dsnw'] = 'mysql://roundcube:pass@localhost/roundcubemail';
+
+// IMAP host chosen to perform the log-in.
+// See defaults.inc.php for the option description.
+$config['imap_host'] = 'localhost:143';
+
+// SMTP server host (for sending mails).
+// See defaults.inc.php for the option description.
+$config['smtp_host'] = 'localhost:587';
+
+// SMTP username (if required) if you use %u as the username Roundcube
+// will use the current username for login
+$config['smtp_user'] = '%u';
+
+// SMTP password (if required) if you use %p as the password Roundcube
+// will use the current user's password for login
+$config['smtp_pass'] = '%p';
+
+// provide an URL where a user can get support for this Roundcube installation
+// PLEASE DO NOT LINK TO THE ROUNDCUBE.NET WEBSITE HERE!
+$config['support_url'] = '';
+
+// Name your service. This is displayed on the login screen and in the window title
+$config['product_name'] = 'Roundcube Webmail';
+
+// This key is used to encrypt the users imap password which is stored
+// in the session record. For the default cipher method it must be
+// exactly 24 characters long.
+// YOUR KEY MUST BE DIFFERENT THAN THE SAMPLE VALUE FOR SECURITY REASONS
+$config['des_key'] = 'rcmail-!24ByteDESkey*Str';
+
+// List of active plugins (in plugins/ directory)
+$config['plugins'] = [
+    'archive',
+    'zipdownload',
+];
+
+// skin name: folder from skins/
+$config['skin'] = 'elastic';
+
+$config['plugins'] = ['managesieve', 'password'];
+$config['managesieve_host'] = 'mail.andreasknuth.de';