Understanding Recipient Policies
To receive letters and packages, a person must have a mailing address to give to senders. This mailing address can be a business address, the physical address of his or her home, or a post office box. Likewise, for a recipient to receive messages in an Exchange mailbox, the recipient must have an e-mail address.
To generate e-mail addresses for each recipient in an organization, you use recipient policies. This section focuses on how recipient policies manage these e-mail addresses, and also how recipient policies manage mailboxes using the Mailbox Manager.
Recipient policies also establish the mail domain for which Exchange accepts incoming mail. For more information, see "Understanding and Configuring Message Routing and Transport."