Exim

Exim is the default mail transport agent installed on some Linux systems; it runs on many versions of Unix and is suitable for any TCP/IP network with any combination of hosts and end-user mail software. It is open source, scalable, rich in features, and--best of all--easy to configure. This official guide is written by Philip Hazel, the creator of Exim. Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.