I've been hosting my email on my own server since the 90s, but got tired of dealing with keeping up with spam filters. Updated the MX to deliver inbound to mailroute.net and have them do the filtering before forwarding to my server and that's been working great for years. Not free, but not expensive and still gives me 99% of the control i want with very good spam filtering too.

Outbound mail is relayed via mailroute too, which solves the tainted IP delivery problem.