Question : Restricting users from Sending and Receiving Internet Mail in Exchange 2003?

How can I restrict some users from sending and receiving e-mails only from approved domains in Exchange Server 2003?  But, these users should be allowed to send e-mails freely to the internal domain.  The unfiltered users should be allowed to send and receive from anyone.

Answer : Restricting users from Sending and Receiving Internet Mail in Exchange 2003?

This is no longer the process that the customer will utilize, and thank you for your feedback.