My mailserver and I outlasted our startup company "batman.com", bought by new company "robin.com". I have all employees setup with both @batman.com and @robin.com e-mail addresses and have both @batman.com and @robin.com registered with WorldCom. The A record is mailserver.batman.com = X.X.X.X and mail inbound for @robin.com points to mailserver.batman.com.
The mailserver is Exchange 5.5 SP4 on NT4SP5 and resides in the batman NT domain and in the Network Properties it says it's part of the batman.com DNS domain. All employees can successfully receive mail from the Internet to both their email@example.com and firstname.lastname@example.org addresses.
QUESTION (How do I pull it off)
I need to change the WorldCom DNS record to make this mailserver not dependent on the existence of batman.com publicly, for the future. To do this, I believe I simply need to swap the WorldCom DNS A record, so that the A record becomes mailserver.robin.com and mail inbound for @batman.com points to mailserver.robin.com.
Is there any reconfiguration I have to do on the Exchange Server side???????
I've asked around... some folks think that in the "Control Panel -> Network -> TCPIP Properties --> DNS Domain" that I need to change it from batman.com to bobin.com but are not sure. Some seem to think that since I'm already receiving mail for both @robin.com and @batman.com, the DNS change with WorldCom should be invisible to the mail server.
Any advice is welcome. Thank you.