A fullstack but simple mail server (smtp, imap, antispam, antivirus...).
Only configuration files, no SQL database. Keep it simple and versioned.
Easy to deploy and upgrade.

Includes:

• postfix with smtp auth
• courier-imap with ssl support
• amavis
• spamassasin
• clamav with automatic updates

Why I created this image: Simple mail server with Docker

• only config files, no *sql database required
• mails are stored in /var/mail/${domain}/${username}
• you should use a data volume container for /var/mail for data persistence
• email login are full email address ([email protected])
• user accounts are managed in ./postfix/accounts.cf
• aliases and fowards/redirects are managed in ./postfix/virtual
• antispam rules are managed in ./spamassassin/rules.cf
• files must be mounted to /tmp in your container (see docker-compose.yml template)
• ssl is strongly recommended, read SSL.md to use LetsEncrypt or Self-Signed Certificates
• includes integration tests
• builds automated on docker hub

docker pull tvial/docker-mailserver

docker build -t tvial/docker-mailserver .

docker run --name mail \
-v "$(pwd)/postfix":/tmp/postfix \
-v "$(pwd)/spamassassin":/tmp/spamassassin \
-v "$(pwd)/letsencrypt/etc":/etc/letsencrypt \
-p "25:25" -p "143:143" -p "587:587" -p "993:993" \
-e DMS_SSL=letsencrypt \
-h mail.domain.com \
-t tvial/docker-mailserver

mail:
  image: tvial/docker-mailserver
  hostname: mail
  domainname: domain.com
  ports:
  - "25:25"
  - "143:143"
  - "587:587"
  - "993:993"
  volumes:
  - ./spamassassin:/tmp/spamassassin/
  - ./postfix:/tmp/postfix/
  - ./letsencrypt/etc:/etc/letsencrypt
  environment:
  - DMS_SSL=letsencrypt

Volumes allow to:

• Insert custom antispam rules
• Manage mail users, passwords and aliases
• Manage SSL certificates

docker-compose up -d mail

# imap
username:         <[email protected]>
password:         <username1password>
server:           <your-server-ip-or-hostname>
imap port:        143 or 993 with ssl (recommended)
imap path prefix:   INBOX
auth method:      md5 challenge-response

# smtp
smtp port:        25 or 587 with ssl (recommended)
username:         <[email protected]>
password:         <username1password>
auth method:      md5 challenge-response

Things to do or to improve are stored on Github, some open by myself. Feel free to improve this docker image.

Fork, improve, add tests and PR. ;-)