I have 2 e-mail servers running in my office that are taking care of 2 different domains. One server is running send mail and the other server is running Zimbra. The username jdoe@domain1.com and jdoe@domain2.com exist.

When I try and send a message to jdoe@domain1.com from the zimbra server I get a user unknown message from Postfix. This makes no sense and any help is appreciated!

Thanks, Brian