I have a user within my organisation who is sending mail to a group of clients, however, the clients are not receiving the mail and the sender is not receiving a bounceback of any kind.
I checked our mail filtering software, Mail Marshall and found the last successfull email sent by the sender to the clients was on the 23/10/08. Since then he has sent 2 other messages which are sitting in his Outlook sent items, but are not displaying on Mail Marshall history.
I checked our Exchange server and set the parameters within the Message Tracking Center. Using the date period of 22/10/08 - 30/10/08 with the appropriate sender and receiver details. It's coming back with 3 emails. 1 of which is the successfull email found in Mail Marshall.
I checked the properties of the successfull email, and found the last event stated "Mail transfered to mail1.ourdomain.com.au through SMTP". This is how it should be.
I checked the properties of the 2 unsuccessfull emails, and found the last event stated "Message transferred to servername.olddomain.com.au through X400".
I checked the server in which the uncussessfull email was transfered to, it's an old NT box with exchange running on it. No one should be using this anymore and it's in the process of being decommissioned. I looked at it's message queues and there are no messages to be found.
I don't understand what could be causing the mail to be going there in the first place... Any help would be greatly appreciated!