[perlgod]

I host email from my basement. Rackmount server down there runs all my VMs, including ones for Postfix, Dovecot, and Rspamd. Apache Solr/Tika are connected to dovecot for full-text IMAP search. Never had any issues, but I have postfix on a static IP from a business-class cable internet connection, so I'm sure that helps.

Dovecot and the postfix submission port (587) are only accessible internally, or through my home wireguard VPN.

Rspamd catches just about all junk mail. I might have one or two messages a week slip through. Moving messages to/from the Junk folder trains Rspamd to recognize spam/ham.

Make sure the IP of your mail server has reverse DNS in place, and set up SPF/DMARC records and DKIM signing, and you should be fine. I've been doing this for a decade and never had any problems.

I do maintain a separate, paid email account at a commercial provider for things like banking. In case I die, I don't want my poor wife to deal with my crazy email setup.

This topic always brings up so many hysterical naysayers, I almost wonder if some are paid Gmail shills!