A grouping of recipients in Microsoft Exchange Server that you can use to send a single message to multiple users simultaneously.
When a message is sent to a distribution list, it is sent to all recipients on the list. Distribution lists provide a convenient way of performing mass mailings to users. For example, a marketing department might create several hundred custom recipients for regular customers outside the Exchange organization.
These custom recipients can then be included as members within a single distribution list. When the department wants to send e-mail to its customers announcing new products or services, the e-mail can be sent to the distribution list.
A computer running Exchange Server (configured to expand distribution lists) makes sure that each custom recipient receives a copy of the message.