Man, these articles come out every once in a while. I'm in this camp. My own email server going on 25 years. I'm also responsible for the email of other businesses as well. And maybe that's the difference? I'm getting paid to understand the nuances in mail delivery? But it's a chore no doubt. I never plan on stopping. EMail is TOO IMPORTANT. I don't have any secret formula other than be reachable. Read your email to postmaster@domain, sign up for all the Postmaster Feedback loops. I have two major issues (which have lessened over time) 1) you have to slow-deliver mail to gmail/comcast/yahoo/hotmail or you will get deferred very quickly. 2) users getting their passwords hacked leading to spam delivery. But I catch that automatically these days with a script that checks the IP of the connection. Too many successful connections from Pakistan within a minute gets the account disabled. It's kept me off blacklists for years.