Quite a lot of critical responses here. Personally I think this is a great write-up. Most people in tech these days appear to look down their nose and say 'oh

Quite a lot of critical responses here. Personally I think this is a great write-up. Most people in tech these days appear to look down their nose and say 'oh no, you can't host your own mail server anymore'. This write-up goes to show that it's not as complex as people seem to think. I'd be curious to see a follow up from the author to address the other claim of this crowd - that the big mail providers mark you as spam due to no existing reputation on the IP, despite all the processes and policy being correct.