Using hub transport rules to prevent sending of external email in Exchange 2007
1. Open Exchange Management Console
2. Drill down to Organization Configuration, Hub Transport and click on the Transport Rules tab.
3. Right click and select New Transport Rule…
4. Enter a name for the rule and description if desired and click next.
5. Place a checkmark next to “from people” and “sent to users inside or outside the organization”. On the bottom half of the screen click the people hyperlink, click add, select a person or group from the list and click ok. Next click the “Inside” hyperlink and change the scope to outside. Click next.
6. Select an action you like to take. I selected to bounce the message and notify the sender. Click next.
7. Choose an exception if desired then click next.
8. Click New to create the rule.
You now have a rule that will prevent the selected user or group from sending any email outside your organization. The rule can be enabled or disabled by right clicking it. If a user tries to send an email and this transport rules applies to them they will receive a non-delivery report back in their inbox.
Delivery has failed to these recipients or distribution lists:
‘outsidemail@somedomain.com’
Your message wasn’t delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
_____
Sent by Microsoft Exchange Server 2007
