numero33/backup-mx repository overview

⁠backup-mx

Simple postfix backup mailserver for your Docker containers. Based on Alpine Linux.

⁠Description

This image allows you to run POSTFIX internally inside your docker installation.

⁠TL;DR

To run the container, do the following:

docker run --rm --name backup-mx -e "HOSTNAME=mx2.example.com -e DOMAINS=example.com,example2.com" -p 25:25 numero33/backup-mx

⁠Configuration options

The following configuration options are available:

ENV vars
$HOSTNAME = Postfix myhostname
$DOMAINS = Domains for relaying

⁠DOMAINS

Postfix will try to deliver emails asap to the primary server.

⁠Security

Postfix will run the master proces as root, because that's how it's designed. Subprocesses will run under the postfix account which will use UID:GID of 100:101.