Phantasm (alt) on Nostr: Postfix/Dovecot is the easy part, you can even cheat with things like Mailcow and the ...

Postfix/Dovecot is the easy part, you can even cheat with things like Mailcow and the new-ish all-in-one email solutions written in Go. It's the deliverability that is annoying to maintain. Are you in a bad IP space or inherited an IP that was used by a spammer, good luck getting that reputation back in a reasonable time. Have fun getting deliveries fully working to Gmail/O365 and not get dropped into spam at seemingly random times.