I installed a new Exchange 2003 server and moved just a couple of mailboxes.
Here is the issue.
I can email to recipients on the old Exchange server from the new one but I cannot receive mail from mailboxes existing on the old server to the new Exchange server.
I would like to correct this so I can move a few mailboxes at a time instead of moving everyone at once.
MX1 (OLD) and MX3 (NEW)
MX3 can email to MX1 mailboxes but MX1 mailboxes cannot email to MX3 mailboxes. NO NDR at this time.