XADM: How to Prevent Everyone in an Organization from Sending SMTP Mail to a Specific Target Address (250521)

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To configure Exchange Server so that all of the users in an organization cannot send SMTP e-mail messages to a specific address, create a custom recipient and set delivery restrictions for that recipient:

1. Create an SMTP custom recipient that uses the e-mail address that you want to prevent users from sending SMTP e-mail messages to.
2. In the custom recipient properties, click the Delivery Restrictions tab, and then perform either one of the following steps:
   • Under Reject messages from, click List, and then either add everyone in the local Recipients container or add a global distribution list (DL) to the Reject messages from list.
   • Under Accept messages from, click List, and then add a single user to the Accept messages from list.
3. Ensure that the display name for the user is the same as the SMTP address (for example, someone@microsoft.com).
4. Click the Advanced tab, and then under Custom recipients options, click to select the Hide from address book check box.

After you perform these steps, if a user in that organization sends mail to the SMTP address, the user receives a non-delivery report (NDR) similar to the following: