I set up my own email on a bsd.amterdam VPS and have had no problems whatsoever. No one drops my mail. I don’t know what slash_nick is talking about regarding maintenance. The only maintenance I have is rotating Let’s Encrypt SSL certificates, and that’s only because I haven’t automated it yet. Domi has good points that can be summarized as “actually do it right”. I got my setup working in about 100 lines of config. Granted, that’s OpenBSD rather than Linux, which is significantly more terse, but it’s still not hard and I wish more people would realize that. That 100 lines includes firewall and network config, to give an idea of how little work there actually is.