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 donโ€™t kid yourself. Itโ€™s hard. So many things to manage:
โ€ข DNS
โ€ข spam filtering
โ€ข email scanning/virus scanning
โ€ข a database server
โ€ข inbox protocols (e.g. imap and exchange)
โ€ข web mail (with a web server)
โ€ข TLS (maintaining the certificate and integrating it with all the various services)
โ€ข OS-level maintenance/backup, etc.

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