Special routing for mail from localhost

[Terry Carmen]

Is there any way to have special routing for mail that's created on the 
postfix server(localhost), destined for mydomain?

The transport map allows for routing based on destination, but I don't 
see any way to route based on source. Currently inbound mail goes from 
the internet to postfix to a content scanner, then to exchange. I'd like 
to have internally generated messages (notifications, etc.) go directly 
to exchange.

Anybody have any ideas?

Thanks,

Terry