@catloaf @monkeyman512 well i might disagree on this.
I started selfhost a couple of services for private use with a pi2 some time ago, and after gaining experience, I finally selfhost almost everything I need : cloud, photos, backups, website, media streaming etc. Including a mail server, on a low voltage unit.
Okay the mail server was a bit trickier to setup but works fine now for 3 years. I'm not get spammed or mark as spam, even without static IP.