Exchange 2010: How to prohibit some users/Group from sending emails outside the organization

I received a request to limit some users to send and receive internal emails only,

as these users are not allowed to send or receive emails from outside the organization.

the users are already grouped in a Group called: deny_outside_email

 

Since we are using Exchange 2010, so there’s no need to get down to denying prmissions on connectors as we used to do in Exchange 2003 days,

Here a couple of Transport Rules are enough to get the work done as:

  • To prohibit sending to External Domains:

image

  • To prohibit receiving from External Domains:

 

image

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