I tried that at first but later discovered that those same people were able to still send outgoing Internet email with the X400 address. How is this possible?
There is a setting in your Exchange Server. I use 5.5. On the Internet Mail Service properties found under Configuration and then Connections, you will see a tab titled Delivery Restrictions. You will see two window panes. The one on the right, click on Modify and add any user that you wish to restrict from being able to send/receiving any external email.
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