We have an Exchange 2003 SP2 hosting two SMTP domains @a.com and @b.com. The OS is Windows 2003 SP1 (it is an SBS 2003 for that matters). The @b.com group is moving off so we have set up a new Exchange for them. Now when @b.com people send emails to @a.com people the mails need to go out of the old server. What is the correct procedure for removing @b.com from the old server?
So far I have tried:
On the old server there is only on Recipient Policy - "Default Policy" which contains two SMTP addresses @a.com and @b.com, with @a.com as primary. I removed @b.com from the policy. When I hit OK it asked if I want to apply the policy down I chose NO. The address space was indeed removed from the policy.
After that, the server won't send any email to outside. All mails are stuck in the queues. Tracking showed they all stopped at "Message routed and queued for remote delivery" but never reached "Start outbound transfer of message".
I put the @b.com back to the policy. The server started to send mail to outside.
I knew I missed some steps here. I had not remove the references to @b.com in users and public folders' email addresses. But I want to know if anybody has done this type of work? Is there a known good procedure to follow? The old server is still the production server for @a.com people. Breaking it will piss them off big time.