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.