Is it possible to create a PO (or do this another way) that can only send/receive emails inside the domain, ie no internet email either sent or received? We would like to give some users an email address, but not allow them to send/receive email outside of our system, while allowing supervisors (for instance) the ability to send/receive internet email. The restricted users would be allowed to email each other and the supervisors. Right now our system is GW2012 with all objects/agents on the same box. Thanks in advance for any advice/suggestions.