I searched all over the inet but still could not find an answer to my problem. I have a mail server (iRedMail) which runs on both SOGo and Roundcube. Roundcube runs just fine, the problem comes when I try to access my SOGo interface over the internet I get this: SOGo interface over the internet
Whilst running same mail server over the local network I get a normal picture like this: SOGo on the local network
My webserver is certified by Let'sEncrypt, my NAT rules are fine, as well as Firewall rules (80,443,25,53). If someone had same problem, please help, thank you.