hey guys, i just started hosting a secondary domain on my server, using zimbra 4.5, and everything is fine in the primary domain (domain1.com), but when i try to send mail to the internal users (userxxx@domain2.com), i get a message saying:

: mail for domian2.com loops back to myself

there's nothing for the external relay, and the smtp server globally is set to smtp.domain1.com. i can send from domain2.com to domain1.com without a problem. domain2.com can send e-mail to external accounts, but i can't send to anyone @domain2.com.

any ideas?