OK, I've finally got my Zimbra box up and running. This box will replace a decrepit old Exchange server.
Both boxes sit behind a firewall. To get mail to the Exchange box, I have a static command on the firewall that ties it's inside IP to the IP tied to the MX Record.
As a test, after hours, I swapped the inside IP of the Exchange server with the inside IP of the new Zimbra box on the firewalls static command. The new server sent and received email.
However, the only way it would receive email was if I put the FQDN of the server in the email address. i.e.
i've got close to 200 users so that is a deal breaker. I can't take it live until this is resolved. I figure I've mucked up something during install but have no idea what it could be. Can I make a change in file, in the Zimbra GUI or do I need to reinstall?