Linux Network Administrators Guide
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Chapter 17. Electronic Mail
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17.4. How Does Mail Routing Work?
The process of directing a message to the recipient's host is called routing . Apart from finding a path from the sending site to the destination, it involves error checking and may involve speed and cost optimization.
There is a big difference between the way a UUCP site handles routing and the way an Internet site does. On the Internet, the main job of directing data to the recipient host (once it is known by its IP address) is done by the IP networking layer, while in the UUCP zone, the route has to be supplied by the user or generated by the mail transfer agent.
17.4.1. Mail Routing on the Internet
17.4.2. Mail Routing in the UUCP World
17.4.3. Mixing UUCP and RFC-822
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