Domain User - A logs into the domain and sets up Domain User B exchange profile in Outlook. Full Access on the mailbox has been granted, and send as right's have been granted.
Whenever trying to send as Domain User - A the following NDR is generated.
The following recipient(s) cannot be reached:
<REMOVED> on 9/8/2010 1:21 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.