If you only have one listener, then removing the "Received" headers would apply to all inbound and outbound traffic.
If you had an inbound and outbound listener, then you could isolate it to one to the private/outbound listener only.
This is good informaiton, however, does it apply when you have only one listener set up on the interface?
I don't want to interupt inbound email by modifing the single listener.
