Ok here is my problem. When I start up zimbra everything starts up just fine and No errors.

If I have the check box Enable DNS lookups in the admin panel under MTA tab checked I can send mail internally and externally but I don't receive any mail to users mailboxes. It stays in the Mail Queues. Now if I uncheck the Enable DNS lookups in the MTA tab I can receive mail in the mailboxes but I cant send mail externally only internal.

Anyone help on what I am missing here and need to change?

Thanks Nick