I've used OpenSMTPD as my mail server since 2013 or 2014.
I briefly moved to Plan 9's mail server, and it worked for sending and receiving, but the incoming messages weren't going to where they were supposed to, and there isn't a lot of support for Plan 9 outside of the 9fans mailing list.
Then I used weasel on ArcaOS (OS/2) for a couple of months and after that I went back to OpenSMTPD. I was having a problem with 6.2 syntax since my previous installation was 5.x and the OpenSMTPD mail list was helpful in solving my problem. Another problem I had back in 5.x I sent an email and Gilles himself replied.
Great mail server and I always recommend OpenSMTPD over Postfix or Sendmail.
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