Regarding IT Projects for Exchange Server, a transport rule can apply actions to messages based on the recipient address.  If you however attempt to use a Distribution List (group) the rule will not save, giving you the following error message:


SentTo predicate does not allow distribution groups. ‘My Group’.



The workaround to this is to instead chose “The Message -> To box contains this person” and then select your group and it should now let you save.