The article points it out, but it used to be harder than it is now. These days (for a long time now, really), it's hard to set one up that's, say, an open rela

The article points it out, but it used to be harder than it is now. These days (for a long time now, really), it's hard to set one up that's, say, an open relay by accident. The default configs are pretty much all you need, just replacing a couple of values with those that are custom. Basically, what you're saying is exactly what they're debunking. Also, the article isn't "just execute these 20 commands", it's deliberately non-technical. I've been running a tiny Postfix mail server since ... 2000 or so, still doing so today. It had grown in to a bit of a monster configuration over 17 years or so, complete with a custom PHP interface to allow me to add user accounts, etc. I learnt a lot doing that, but a couple of years ago I started it all from scratch, with a default config and writing the config into my ansible setup so I don't have to remember it. It was very easy to do. Since then, I've touched that configuration once. One thing I will mention because I haven't seen it around enough, and didn't know of it until someone said it in passing: if you're getting smap-trapped by gmail a lot, turn on TLS support for outgoing. Made a lot of difference. For postfix that's just adding: smtp_tls_security_level=may to main.cf. Don't know why that isn't default.