I would have thought Zimbra would send the message to postfix, postfix looks up the MX record and the email is sent to your real mail server.
If I'm wrong I'm really going to be interested in the answer from the Zimbra people.
To get over this we put an MX record that the test machine so the test machine has it's own A and MX records in DNS. It means emails need to have the fully qualified DNS address too. |