I had my Zimbra NE test server up last week. I spent the weekend sick and did not get a chance to do much with it. Yesterday evening I noticed I could not send to it any email@example.com
(ultimately generated from firstname.lastname@example.org)
unknown local-part "user.test" in domain "zimbratest.domain.com"
I've got it setup as a secondary mail sever "zimbratest.domain.com" along with "mail.domain.com" as the primary for "domain.com". My main server is running Exim3 as the MTA and I think this is the culprit, but I'm not sure.