OK. Here's the setup. I have an environemnt with two servers that are twins in HW and SW. The SW is as follows;
Windows 2003 R2 Enterprise Edition
Exchange 2003 Enterprise Server SP2
Server A and Server B
Server A is an older server. We are moving some of the mailboxes from A to B. After moving a test batch of users we begain to test, and here's what we have.
Mail from server A can go to server B without a problem.
Mail from B heading to A sits is a queue and is undeliverable with the following error a the queue *The connection was dropped by the remote host". Server B can send and receive external email, but cannot send to server A. The message gets queued and eventually times out.
I'm not sure where the issue is. DNS seems to be working OK, as are all other network functions. No errors in the event log at all.
Any help would be greatly appreciated.
Thanks in Advance...