Hi, I'm running a ISPConfig 2.2.35 server who doesn't want to forward mail to the same domain as the hostname. Let's say the servers hostname at the datacenter is server1.mydomain.com running ISPConfig, the other mailserver at the office is server2.mydomain.com running Zimbra. All mail forwarded from server1 to server2 with the domainname @mydomain.com gives the error 'user unknown'. When I create a testuser on server1 (not with ISPConfig), testuser can receive mail as [email protected] so there must be an network error but I can't figure out how to solve this. Any idea?