mox Mail Server
I currently use Purelymail for email. It’s very cheap and does everything I need (“purely email”). I’m also happy that I’m free of all the headaches of having a good IP reputation and setting everything up so that my mail doesn’t end up in junk folders.
But if I want to do self-hosting again, there’s a new promising solution, and it’s written as a single (Go) application instead of a composition of several different programs, so it should be easier to set up: mox.
It was published on Hacker News and the author left many comments.