MTA-STS

A small server responding to the /.well-known/mta-sts.txt path.

Status: feature-complete, pull requests are accepted.

Preparation

You need to set up DNS records correctly, otherwise this server will be useless. The server must be available on the mta-sts subdomain.

Configuration

All configuration is done through environment variables.

Server settings

Select one option:

• SOCKET_PATH - Unix socket path, for example: /run/mta-sts.sock.
• LISTEN_ADDRESS - Address for the server, for example: 127.0.0.1:8080.
• PORT - The port used by the server, 8080 by default (deprecated, prefer LISTEN_ADDRESS).

MTA-STS settings

• 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)
• MTA_STS_MX - list of mail servers separated by commas, for example: "mx1.example.com,mx2.example.com"

Docker-compose example

services:
  mta-sts:
    image: ghcr.io/ordinary-dev/mta-sts
    environment:
      MTA_STS_MX: mx.example.com
    ports:
      - 80:8080