distribution group

A group of recipients created to expedite mass mailing of messages and other information. When e-mail is sent to a distribution list, all members of that list receive a copy of the message. [Exchange 2003]

A mail-enabled Active Directory group object. In Exchange 2007, a distribution group refers to all mail-enabled groups, whether they are an Active Directory security group or an Active Directory distribution group. When an e-mail message is sent to a distribution group, all members of that list receive a copy of the message. [Exchange 2007]