I have a complex situation so I'll try to describe it as best I can.
We have a distribution group called firstname.lastname@example.org and the members are Alan, Bob, Charlie, David and Eddie
If an email comes to email@example.com, all members receive a copy. So far so good.
If an email comes to firstname.lastname@example.org from email@example.com we want to stop this email arriving with Charlie and David but everyone else must get it.
Is this possible using transport rules in Exchange 2007 management console?