I recommend iRedMail to people who want to self-host their email. It handles lots and lots of stuff. DKIM, mailing lists, database-backed addresses and domains, etc. But don’t kid yourself. It’s hard. So many things to manage:
β€’ DNS
β€’ spam filtering
β€’ email scanning/virus scanning
β€’ a database server
β€’ inbox protocols (e.g. imap and exchange)
β€’ web mail (with a web server)
β€’ TLS (maintaining the certificate and integrating it with all the various services)
β€’ OS-level maintenance/backup, etc.

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