I just set up a mailserver on my new Hetzner VPS running aapanel and while I can send emails via smtp or runbox webmail with no problem, I am having a problem receiving emails from some accounts but not others.
Emails from Gmail / Google Workspace accounts do not arrive. Proton mail do. I can email another mailserver own running cpanel but when i reply it does not arrive. Another account I have works fine. Some servers work, some don't.
Emails from some servers just do not arrive in my account. They do not bounce back either. They just disappear. Can anyone know what the issue might be? How can I troubleshoot this?
