1. <networking> "NAT" (Linux kernel name).
2. <messaging> Hiding the names of internal e-mail client and gateway
machines from the outside world by rewriting the "From" address and other
headers as the message leaves the organisation.
This is good practise because external users do not need to know about internal
changes in message routing. The external mail gateway needs to know how to route
incoming replies back to the original sender.
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