Hello everybody, I have MC running with a public IP and domain. Everything works like a charm. Now I need to move my mailserver to another server with only one additional IP. I migrated everything and the server is running in lan 192.168.21.102. I set the following port forwarding:

Checking on mxtoolbox is postiv but I am not able to sent or receive mails from outside nor accessing the Gui. Anybody any idea what I am mising? Thanks for some help