I have had my Zimbra server running for awhile as a test server and now I have started migrating users over to it. I decided to run it in split domain so I didn't have to move everyone at once. I have made Zimbra my primary and my old sendmail server secondary and followed the instructions. However I am getting "mail for xxxx.domain.com loops back to myself" on emails sent from both my web client, and external users to emails not hosted on my zimbra server yet. My MX record is set for the zimbra server and the MTA relay is blank. I have searched the forum and cannot find anything helpful.