I have 2 domains
one NT4 & Exchange 5.5
one W2k3 & Exchange 2k3
I can send and receive messages to users at a company called 'area-adubon.com' when logged in and using the Exchange 2003 server as mail agent.
I can only recieve from 'area-audubon.com' when logged on and using Exchange 5.5 server.
I get a NDR report with the following:
Your message did not reach some or all of the intended recipients.
Subject: 5.5 test
Sent: 8/10/2005 1:51 PM
The following recipient(s) could not be reached:
User on 8/10/2005 1:51 PM
Unable to deliver the message due to a communications failure
I was thinking that maybe they had the domain that the 5.5 server is on blocked or something.
It started about a week ago. Before that all was well.
I have made no changes to that domain or server.