Hi Running Exchange 2007 SP2. I have a DL set up that contains three external contacts as members. The DL has email address: external1@mydomain.com The contacts are: user1@hotmail.com, user2@gmail.com, user3@yahoo.com How does this work exactly? Why does the DL itself need an email address? Surely all it's doing is forwarding the email to the three external recipients? And what if I added an internal recipient to this DL, how does the DL email address affect this?