berrygoudswaard/mail repository overview

⁠docker-mail

This is a simpel postfix setup that:

• forwards incoming e-mails to an existing emailaddress
• is able to send e-mails
• uses spamassassin to fight spam
• uses saslauth to authenticate (only one user)
• allows multiple domains
• uses opendkim

⁠How to use this image

docker run \
  --name mail
  --hostname mail.example.com \
  --volume /data/opendkim/keys:/etc/opendkim/keys \
  --env MYORIGIN="example.com" \
  --env VIRTUAL_ALIAS_DOMAINS="example.com example.nl" \
  --env VIRTUAL_ALIAS_MAPS="@example.com [email protected];@example.nl [email protected]" \
  --env TRUSTED_HOSTS="example.com;example.nl" \
  --env USER=myusername \
  --env PASSWORD=mysecret \
  --publish 25:25 \
    berrygoudswaard/mail

The hostname is set as myhostname in the file /etc/postfix/main.cf
MYORIGIN is set as myorigin in the file /etc/postfix/main.cf

Use VIRTUAL_ALIAS_DOMAINS to tell postfix which domains are OK.
With VIRTUAL_ALIAS_MAPS you can tell postfix what the forward address is for specific domains/mailaddresses.

TRUSTED_HOSTS tells opendkim which domains are OK (seperated by a semicolon)

The USER and PASSWORD are for SASL auth. When the container is started user is created automatically.

Don't forget to create a volume for your opendkim keys. In this example the host folder /data/opendkim/keys has the following structure:

• data
  • opendkim
    • keys
      • example.com
        • mail.private <-- the opendkim key for example.com
      • example.nl
        • mail.private <-- the opendkim key for example.nl

Use --env BLACKLIST=zen.spamhaus.org to configure a blacklist for Postfix.