Hosted my own email server because of this crap
This is exactly why I decided to use the following guide to build and host my own email server -
Slightly outdated, but still valid once you tweak a few elements like choosing different CA or DNS provider. Or you can do it the lazy method and use iRedMail - https://www.iredmail.org/ which is scripted.
If a Linux begineer like myself can do it, anyone who is fairly computer savvy can.