Incoming Internet mail cannot be regulated on a per-user basis

In Microsoft Exchange Server 5.5, you can restrict users from receiving e-mail from the Internet by removing the Simple Mail Transfer Protocol (SMTP) proxy address for a specific user.

Note If the X.500 address of the Exchange Server user is known, incoming SMTP e-mail can still be delivered to a user whose SMTP address has been removed from the e-mail addresses page.

In Exchange 2000, this solution is not possible because SMTP is the native addressing format. Therefore, there is no way to control the permissions of users to receive Internet e-mail. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

To restrict users from receiving Internet e-mail in Microsoft Exchange 2000, you must create two SMTP addresses, for example user@microsoft.com and user@microsoft.local. To do this, use Exchange 2000 recipient policies. Assign the microsoft.local address to all users and the microsoft.com address to only the users who are allowed to receive Internet e-mail. This allows all users to receive Internal e-mail, but disallows specific users to receive Internet e-mail because the microsoft.local address is not an allowed Internet e-mail address.

Note Internet e-mail can still be received if someone directly connects to Exchange SMTP port 25 and sends e-mail to user@microsoft.local.

Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.

For more information about Exchange 2000 recipient policies, click the following article number to view the article in the Microsoft Knowledge Base: