I've setup NDRs on an 07 setup and can get the NDRs at the Postmaster address. However, I am trying to get the NDRs emailed to an external SMTP address. I've tried setting up a Transport Rule to catch Undeliverable as a subject and forward it but it doesn't seem to work. I even tried to setup (not my preferred method) a rule on the postmaster account to forward messages with Undeliverable in the subject to my external email address but nothing seems to work. If I email postmaster with a subject Undeliverable it works. Anyone have any insight on this issue? How can I forward the NDRs?