Using the free, open source Exim MTA to deliver mail on Linux systems.
Configure Exim to Serve as a Lightweight, Send-only SMTP Server on Ubuntu 12.04 LTS (Precise Pangolin).
Configuring Exim to serve as a lightweight, send-only SMTP server on Debian Linux.
Configure Exim to serve as a lightweight, send-only SMTP server on Debian 6.
Configuring Exim to serve as a lightweight, send-only SMTP server on Ubuntu 10.04 LTS (Lucid).
Configuring Exim to serve as a lightweight, send-only SMTP server on Ubuntu 10.10 (Maverick).
Configuring Exim to serve as a lightweight, send-only SMTP server on Ubuntu 11.04 (Natty).
Configuring Exim to serve as a lightweight, send-only SMTP server on Ubuntu 9.10 (Karmic).