I use G Suite nowadays, but I used to self-host up until a couple years ago. Mailcow is (or at least was) pretty nice and reliable: https://github.com/mailcow/m

I use G Suite nowadays, but I used to self-host up until a couple years ago. Mailcow is (or at least was) pretty nice and reliable: https://github.com/mailcow/mailcow-dockerized https://github.com/mailcow/mailcow-dockerized