Not saying I don't appreciate the write-up but I wish they titled it "send-only".

While setting up your own e-mail server is like pulling teeth there are still plenty of people interested in doing it anyway... and I could see it being really annoying if you thought you finally found /the/ guide only to be let down once again.

As someone who hosted it for a very long time - don't. Not worth the effort, it's a huge pain.

Great learning lesson, but very frustrating (IP reputation is everything, blocking spam is beyond hard)

As an alternative: install Mox and do as the installer says.

Seeing up your own mail server is too hard, particularly if you don't use one of the easy ways.