How to Set a Distribution List as Restricted

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One deterrent against spam is to use restricted distribution lists within your Exchange organization. A restricted distribution list allows only authenticated users to send messages. This is especially important because, if spammers knew the alias of a distribution list, they could reach many of your employees with one e-mail message. Restricting distribution lists is especially effective for large lists that contain many nested distribution lists.

Note

Be aware that many spammers use dictionary attacks (attacks using software that opens a connection to the target mail server and then rapidly submits millions of random e-mail addresses) as a mechanism to reach recipients. Distribution lists are often represented by an alias that is a common dictionary word.

Procedure

To set a distribution list as restricted

  1. In Active Directory Users and Computers, open the property page of the distribution list.

  2. Click the Exchange General tab, and then select the From authenticated users only check box.