I guess you use blob-free Linux-libre then?

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Because it was a shameless copy of SMF which is also great.

OpenBSD:

• does not run systemd

Conclusion: OpenBSD wins

Thank you! :-)

If you try it, report back. ;-) My current setup is mostly OpenSMTPD & Dovecot, but I’m open for good reasons to move away.

Websites do not have the functionality to connect to mail servers. These are different protocols.

For mail server infrastructure, Stalwart is said to be pretty good. I haven’t had a chance to try it yet.