This question is slightly involved as it incorporates our proprietary software developed by my company, I will explain the best I can.
We have a Newsletter service for Real Estate agents.
Our application masks the From field to match that of the users Personal email, for instance an @aol.com or @yahoo.com address. So when Joe User recieves the newsletter it appears it came from Joe RealEstateAgent.
In some cases our users have Contacts that are invalid email addresses.
Since our application Smart Hosts ALL system messages through our Exchange 2003 server, when an NDR is generated it is Generated by our Exchange server.
Now to the problem that I am facing:
The NDR is generated but is not being delivered to the proper place. I am able to view the NDR and the 'To:' Field says the correct address however, it is not arriving there ever.
If the address that the NDR is going to exists as a user in our domain however, the message will arrive at the correct recepient.
I understand if no one can help me, I am pretty self-sufficient and I know I can probably eventually figure it out, but I know there are some brilliant minds on this site and figured I would give it a shot.
Any help is appreciated.