ok, the ‘bat book’ and sendmail are seriously weird and scary. So years ago I chewed my way through a qmail install. It was allot of work. It was strange. it ended up to be working, but I was not looking forward to doing it again. I looked what people hat to say about other MTAs. Some people mentioned postfix, but there was a back and forth about qmail and postfix.
Then I lost some email. That is motivation enough.
I tried postfix. I thought it would take hours, like it did with qmail.
Instead it took minutes.
Postfix is so much nicer than qmail for the casual mail hoster,
it is unbelievable. qmail? shiver. Don’t even bother. postfix is it.