Lightweight Mailserver in Docker

The server part is a docker image made of multiple services supervized by s6. It includes:

• Postfix
• Dovecot
• SpamAssassin
• OpenDKIM
• OpenDMARC
• Web-UI dashboard (optional)

Check out the example docker-compose.yml for a full setup behind Traefik

• latest - for the latest version
• branch - for the latest version on that branch
• sha1short - exact commit
• v1.2.3 - exact release version (stable)
• v1.2 - major release version (stable)

For a variant with dashboard append "-dashboard" to one of the above.

• POCKER_SUBDOMAIN - your mail subdomain - example: mail
• POCKER_DOMAIN - your mail domain - example: example.com
• POCKER_TRUSTED_PROXIES - space separated list of trusted proxy ips or hostnames (usually a container name of proxy container on the same docker network) - example: 192.168.0.123 traefik haproxy

*-dashboard only:

• POCKER_PAGE_TITLE - title of the optional dashboard - example: Pocker Dashboard
• POCKER_LOGO_URL - link to the logo image of your choice - example: https://some.website.com/image.png

Bind mount the following directories to your host or use a named volume if you preffer:

• /etc/letsencrypt/live - letsencrypt directory (expects certbot-like format)
• /var/mail - location of actual mail
• /etc/userfiles - for persistent users (mount and don't touch)
• /etc/opendkim/keys - it makes sense to keep opendkim keys persistent across container restarts

For more information refer to the example docker-compose.yml.

If you chose to use the *-dashboard variant the image, there is a web-UI running on localhost:8080/dashboard.

If you don't want a dashboard, just use the basic tools to do the job. e.g.:

# Make sure the user is in the mail group
docker exec -it useradd -m -G mail john
# add password to the user
docker exec -it passwd john