I'm looking for a way to prompt a user that they are sending outbound email
to particular email addresses and let them stop sending the message if it
meest certain criteria.  I.e., outside of the company or to a personal
address rather than a business address, etc.

Does anyone have any examples or know where I can get an add on for this?  
I've seen this at customer sites, but need it for our company as well.

Thank you.

Robert