Copyright © 2005 Eric S. Raymond This document is an
introduction to the world of electronic mail (email) under
Linux. It focuses on user-level issues and typical
configurations for Linux home and small-business machines
connected to the net via an ISP. You need to read this if you
plan to communicate locally or to remote sites via electronic
mail. You probably do not need to read this document if don't
exchange electronic mail with other users on your system or with
other sites. For information on configuring and administering
mail, see the Mail Administrator HOWTO.