I have set up an Exchange 2007 transport rule that should be rejecting email messages to a specific member inside our environment from anyone outside our environment. It should prepend the Subject line, send a bounce message, and silently drop the message...but it is doing none of these. I have tested sending a message to this user from a Yahoo! address and it routes to him properly. I have included a screenshot of my settings, the rule is enabled...if you need any further info just let me know.