Many people are saying it is hard to run a mail server, but I never had any deliverability issue with mine. The most important (well hard because I needed ISP

Many people are saying it is hard to run a mail server, but I never had any deliverability issue with mine. The most important (well hard because I needed ISP collaboration) step was to get a reverse DNS for the IP. I am sending emails from a few domains, so not too much. And my volume is low (10 per day). I run openbsd and I mostly followed that guide https://prefetch.eu/blog/2020/email-server/ https://prefetch.eu/blog/2020/email-server/