I have a user who is a member of a distribution group.
Currently the user and the distribution group can both receive external email.
I would like the user not to receive external mail sent to his own address, only to receive external mail sent to him via the distribution group.
In the users mailbox properties - Delivery Restrictions, I have tried the "only senders in the following list" and adding the distribution group, and also the "require that all senders are autheticated" setting. However when I enable these settings, email is blocked when addressed to the user (as expected) but also email sent to the distribution list.
How do I acheive this in Exchange 2007 ?