XFOR: How to Restrict SMTP Access (244008)

SUMMARY

Exchange Server can selectively limit access to Simple Mail Transfer Protocol (SMTP) mail for specific users. You can prevent specific users from sending or receiving SMTP mail in two ways. One is to restrict inbound SMTP mail to specific users, and a second is to restrict outbound SMTP mail from specific users. This article explains how to accomplish these two tasks.

MORE INFORMATION

Restrict Inbound SMTP Mail to Specific Users

To prevent a user from receiving inbound SMTP mail, remove the SMTP address from the user's mailbox.

In the Microsoft Exchange Server Administrator program, open the properties on the mailbox you want to restrict.
Click the Email Addresses tab.
Click the SMTP address, and click the Remove button.

NOTE: If the X.500 address of the Exchange Server user is known, inbound SMTP mail can still be delivered to a user whose SMTP address has been removed from the Email Addresses page.

Restrict Outbound SMTP Mail from Specific Users

To prevent a user from sending outbound SMTP mail, set a delivery restriction on the Internet Mail Service to reject all messages from that user:

On the Internet Mail Service Properties page, click the Delivery Restrictions tab.
Under Reject Messages From, click List.
Click Modify, and click the mailbox you want to restrict.

The Internet Mail Service will now reject any outbound messages that it receives from that mailbox.

NOTE: The removal of SMTP addresses for a large number of users can be accomplished with a bulk import. For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

184536 XADM: Removing E-mail Addresses Through Directory Import

155414 Bulk Import/Export FAQ