I have Zimbra up and running on RHEL4.
I've migrated 2 users to test.
I've configured a Split-Domain system.
I've configured Zimbra GAL to point to my AD and tested succesfully.

I can send mail to my AD/Exchange Users.
However, when I reply I get NDR {see below}.

I have an mx record configured in DNS which points to the Zimbra system.

What am I missing? I need to finalize this today....

Thanks in advance for any assistance.


NDR results:
Your message did not reach some or all of the intended recipients.

Subject: Test email
Sent: 12/7/2007 10:23 AM

The following recipient(s) could not be reached:

ZZZ ZZZ on 12/7/2007 10:23 AM
The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
<mail2.mydomain.com #5.1.1>