Also Stalwart Mail supports JMAP which is a nice protocol. Not sure how many email clients support it yet though. If I were to host my own mail I'd probably go

Also Stalwart Mail supports JMAP which is a nice protocol. Not sure how many email clients support it yet though. If I were to host my own mail I'd probably go with Stalwart as it provides a single binary/service for running imap, jmap, smtp, etc. No need to fiddle around with Postfix, Dovecot, etc.