Any help is appreciated!

Here is the short and sweet advice that should work for you via a compose.yaml reference.

Be aware what you've asked for isn't officially supported, so when upgrading DMS in future do pay extra attention to our changelog (as this advice is not officially supported, such breakage may not be as obvious). It's possible a future release breaks the advised solution (generally I try to enable users to customize and have control, but that sometimes conflicts with DMS scripts and expectations of what DMS has authority over).

Adapt the following reference to your own compose.yaml:

services:
 dms:
 image: ghcr.io/docker-mailserver/docker-mailserver:15.1
 hostname: m…