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It’s a bit unconventional maybe, but I vote simple-nixos-mailserver
- IF you are curious / willing to learn nix. It’s essentially just sanely configured dovecot, postfix, rspamd.
My config for those three combined is about 15 lines, and I have never had an issue with them. Slap on another 5-10 lines for Roundcube as a webmail client.
Since it’s Nix, everything is declarative, so should SOMETHING happen to the server, you can be up and running again super quickly, with the exact same setup.
In that case I can really highly recommend it. Nixos on the server is fantastic anyways, and the only hurdle to recommending simple-nixos-mailserver is that most people are not familiar with nix… 😄