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Restricting a user from sending e-mail to external mail IDs

SearchExchange.com expert David Sengupta shows you how to restrict a user from sending e-mail to external mail IDs.

How can I restrict a user from sending e-mail to external mail IDs? They should be able to send e-mail only to...

internal mail IDs within the domain.

VIEW MEMBER FEEDBACK TO THIS ASK THE EXPERT Q&A.

To restrict a user from sending e-mail to external mail IDs follow these steps:

  1. Create a mail-enabled distribution group containing the user in question.
  2. Create a basic SMTP connector, selecting whatever SMTP Virtual Server (VS) you want it associated with (typically the default VS).
  3. Assign it a default address space of type SMTP with e-mail domain set to "*".
  4. Use the "Delivery restrictions" tab to populate the "Reject messages from" field with the distribution group you defined earlier.

Once this is done and you've clicked OK to get out of these screens, the user in question will not be permitted to send mail to the Internet.


MEMBER FEEDBACK TO THIS ASK THE EXPERT Q&A:

This solution did not work for me on a Windows 2000/Exchange 2000 site. I tired restricting the distribution group and the individual users from all three SMTP connectors with no result. The external email was still sent from the user. Do you have any ideas?"
—Christopher J.

******************************************

Good catch... I missed one step that needs to be included in order to enable restriction checking in the registry. This step is only required if you're using a distribution group to configure the restrictions (which I'm recommending). You'll want to follow the steps in Microsoft Knowledge Base article 277872 XCON: Connector delivery restrictions may not work correctly in order to force the connector to check for restrictions prior to delivery.

Thanks for writing in.
—David Sengupta, Exchange Server Administration Expert


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This was last published in February 2006

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