docker-postfix

run postfix with smtp authentication (sasldb) in a docker container. TLS and OpenDKIM support are optional.

Requirement

• Docker 1.0

Installation

1. Build image

$ sudo docker pull catatnight/postfix

Usage

1. Create postfix container with smtp authentication

$ sudo docker run -p 25:25 \
    -e maildomain=mail.example.com -e smtp_user=user:pwd \
    --name postfix -d catatnight/postfix
# Set multiple user credentials: -e smtp_user=user1:pwd1,user2:pwd2,...,userN:pwdN

2. Enable OpenDKIM: save your domain key .private in /path/to/domainkeys

$ sudo docker run -p 25:25 \
    -e maildomain=mail.example.com -e smtp_user=user:pwd \
    -v /path/to/domainkeys:/etc/opendkim/domainkeys \
    --name postfix -d catatnight/postfix

3. Enable TLS(587): save your SSL certificates .key and .crt to /path/to/certs

$ sudo docker run -p 587:587 \
    -e maildomain=mail.example.com -e smtp_user=user:pwd \
    -v /path/to/certs:/etc/postfix/certs \
    --name postfix -d catatnight/postfix

Note

• You can assign the port of MTA on the host machine to one other than 25 (postfix how-to)
• Read the reference below to find out how to generate domain keys and add public key to the domain's DNS records

Reference

• Postfix SASL Howto
• How To Install and Configure DKIM with Postfix on Debian Wheezy
• TBD