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Thanks, and I happen to already be aware of it. It doesn’t have any of that. And it’s more complicated to hook it into other things, since the good old postfix is the default case and well-trodden path. I think I’ll try Stalwart anyways. It’s a bit of a risk, though. Since it’s a small project with few developers and the future isn’t 100% certain. And I have to learn all the glue in between the mailserver stuff, since there aren’t any tutorials out there. But both the frontend, and the configuration and setup seem to make sense.
I don’t think the internet gave particularly good advice here. Sure, there are use-cases for both, and that’s why we have both approaches available. But you can’t say VMs are better than containers. They’re a different thing. They might even be worse in your case. But I mean in the end, all “simple thruths” are wrong.