I am very new to Zimbra and hope that you guys will be able to assist me. I have installed Zimbra (testing) and it works brilliantly. Before stating my case - I have checked the forums and found part solution but the problem still persists.
What I have noticed that when I send out to a specific domain - I get this error message - .... 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) (in reply to RCPT TO command).
YES, when I enable DNS lookup under MTA it works 100% BUT then all incoming emails are then sent to the deferred queue (connection refused) and obviously when I disable DNS lookup - all incoming emails are 100% but then I have the problem of sending to that specific domain again.
Have I missed something out?
Will appreciate your assistance.