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I don't think it's you, it generally is a bad practice to have multiple processes inside a container. It usually defeats most of the isolation, introduces problems with handling zombie processes (therefore you need an init) and restarting tools when they crash (then you need something like supervisord, which I guess this image might use - I didn't check). Each software adds dependencies, which can conflict (again defeating the idea of containers), and of course CVEs. Then you have a problem with users etc.
So yeah, containers are generally not meant to be used this way. The project might be cool but I would be very uncomfortable running it like this, especially if that's going to be my primary email, with all the password resetting capabilities etc.
Reading the Dockerfile in their repo, it's simply a clean debian:slim with four compiled rust binaries placed into it. There's no services, no supervisord, nothing except the mail server binaries themselves.
Does it run multiple processes inside the container? Looks like the entrypoint only launchs one.