I host my own servers and have no problems with it, here some hints: https://support.google.com/mail/answer/81126 https://support.google.com/mail/answer/81126

I host my own servers and have no problems with it, here some hints: https://support.google.com/mail/answer/81126 https://support.google.com/mail/answer/81126 https://www.mail-tester.com/ https://www.mail-tester.com/ https://mxtoolbox.com/diagnostic.aspx https://mxtoolbox.com/diagnostic.aspx Test test test, and you will be fine.