One of my users is send a message to another user on another domain and the message is bouncing back. Now I personally don't have access to my exchange mail server thus I can't verify logs to make further analysis, however need to dig bit more so I can kick my IT a bit to do what I think they need to do. This is the error message (excluding the actual domain name for privacy purposes and all domain names are replaced with the word domain, and all domains are legally registered and the source domain uses MS Exchange 2003 and destination mail server type is unknown):
Arrival-Date: Wed, 28 Feb 2007 16:39:54 +0000
Diagnostic-Code: smtp;550 No such address
We all know depending on the server type that the status of 5.0.0. means few different but similar things and in this case again, the destination user address does exist, his or here's mail box is not full, and all domains in question don't have any DNS problems nor is any of them acting or attempting to act as a relaying spam capable domain.
Any feedback I can get is highly appreciated!