|There was no "Exchange" category so my question's goin in the server os category...|
we have a client who has an in-house exchange server, but they need more security. Specifically, is there a clever (cheap...easy...) way to ALLOW INTERNAL emails, but require a PASSWORD for external-bound emails?
I looked through the Transport Rules and i see plenty of ways to redirect emails, but nothing about requiring a password to send. I'm thinking a 3rd party smart host might end up being part of the solution, but i'm not sure.