Recently I have undergone a massive change, we have decided at our organization to go with Snow Leopard server in place of our Leopard Servers. Knowing that this could be problematic to use Apples built in GUI for migrating data I decided to start with a 100% clean configured Snow Leopard server and slowly start to migrate items over to the new server. Our current Leopard Server was running an DNS, Open Directory Master, Mail, and Wiki Server services. I have decided to share my experience in migrating our mail from one server to another.

setup the 10.6.2 Snow Leopard server clean before I did anything I setup DNS on the server and manually retyped and rechecked all of the DNS records from the 10.5 server to the 10.6.2 server. Once I verified that the DNS records were set. I checked the server’s DNS by running sudo changeip -checkhostname and it came back clean. Great good to go, or so I thought.

I had setup split horizon DNS on the server, the Open Directory Master, has already been setup on a single use Mac Mini Server. The Mac Mini Server is running the ODM and DNS. The DNS on the Mini is self referencing and my router has the public ip mapped to the private. The new Mail server (10.6.2) also running DNS had a record pointing to the public ip of the ODM. Great, next step bind the mail server to the ODM so that I can start to migrate mail accounts. Read more..