I have just set up a new Exchange 2k3 in the same organization as my Exchange 2K. Everything I am doing now I have done in a practice setup and all worked fine. The new mail server joined the organization just fine.
The only problem that I have is sending mail from a MB on the new 2k3 server to a MB on the 2k server. The mail transfer hangs after the command
354 Send Binary Data
I verified this with SMTP logging and a sniffer from Ethereal.
If I send mail from 2K to 2K3 all works OK. I have seen threads regarding firewalls having problems with this SMTP command but this transfer does not occur through a FW. Both servers are on the same subnet. Transmission is from NIC to NIC.
Does anyone have any ideas about this????