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How to restrict users from receiving and sending external email

I’ve seen lots of people asking how to restrict users from receiving and sending external email.

I must thank CJ (and Chris for the following though)

First of all give the users you want to restrict a non-valid email address like user@noemail.company

Leaving the X.400 address intact enables them to communicate with their co-workers internally since Exchange 5.5 uses X.400 behind the scenes.

Next add the users to the prohibiting them to send tab on the Internet Mail Connector.

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