> None of my emails are considered as spam, and I haven't touched the mail configuration since.

Sounds like you never actually tried to measure the delivery rates of your outgoing email. No email server is actually able to get 100% of its outgoing mail past spam filters.

I've ran my own email server for a few years and I can confirm that the article is making false claims. It's incredibly difficult to deliver email as a low volume sender. The article falsely claims that it's not difficult and that people simply haven't tried it. Well guess what, I did try it - for years - with countless hours sank into it.

I wrote a blog post documenting my numerous, unsuccessful efforts to get my email delivered. I wish people would stop spreading these baseless falsehoods.

https://www.attejuvonen.fi/dont-send-email-from-your-own-ser...