Simple MTA-STS setup

This is an overly complicated way to set up MTA-STS. Or maybe not?

I wrote this server to make it easy to set up multiple mail servers.

Configuration

You need to set up dns records correctly, otherwise this server will be useless. This container needs to be launched at: mta-sts.your-domain.com. As a result, a file for configuring mta-sts will be available at /.well-known/mta-sts.txt. All configuration is done through environment variables.

Environment variables

• PORT - the port used by the server, 8080 by default
• MTA_STS_MODE - one of the following values: enforce, testing or none (enforce by default)
• MTA_STS_MAX_AGE - the maximum lifetime of the policy in seconds, default - 604800 (7 days)
• MTS_STS_MX - list of mail servers separated by commas, for example: "mx1.domain.com,mx2.domain.com"

Docker-compose example

services:
  mta-sts:
    image: ghcr.io/ordinary-dev/mta-sts
    environment:
      - MTA_STS_MX=mx.domain.com

Learn more

• Article on Dmarcian