So I know if I create an AD account and don't create a mailbox I can assign an external email address to it. This works perfectly if I add it to an internal distribution group and I want the external smtp account to receive it also.
Here's the catch, it doesn't appear to send to the external smtp address if a incoming email is sent to the internal distribution. I would have expected all on the internal distribution list to receieve it as well as it been automatically forwarded to external smtp address that part of the DL. It's not been sent back out
Anyone know why this doesn't work?