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I've been hosting my own mail since 1996. It's actually one of the easier services to self-host: 1) SMTP was developed for unreliable environments. If you have problems with uptime, your incoming email will bounce around for 5 days before it gets dropped. So assuming you can get your SMTP server running one day out of five, you shouldn't be in danger of losing anything. 2) Contemporary daemons like postfix and doveco…
Hats off to ya. I used to view setting up your own email services as a rite of passage for any UNIX admin worth their salt. SMTP was one of the first services I ever got working on my home Linux box, and I had to do it with Sendmail and the goddamn Bat book. Nowadays it's a bit easier.
By the way, I still feel that Sendmail has to have the worst configuration file I have ever seen.