Security
Sendmail Security, Sendmail without the Superuser, Sendmail Workaround for Linux Capabilities Bug, Setting up sendmail on a firewall, Part 1, Setting up sendmail on a firewall, Part 2, Setting up sendmail on a firewall, Part 3
Spam Filtering
Anti-spam information, Blocking Mailed Spam, Configuring a spam-resistant Sendmail, Disabling Relaying, Email bombing and Spam, How spam is sent, Installing, and spamming, Sendmail 8.9, Sendmail spam filters, Spoofed/Forged Email, The Antispam Home Page
A First Guide for E-mail Installation
A draft about the installation/configuration of sendmail.
Anti-Spam Configuration Control
Instructions for configuring Sendmail to prevent relaying and reject spam.
Elandsys.com: Sendmail
Features a tutorial on how to install and configure it.
Explosion in a Punctuation Factory
Excellent tutorial on how sendmail's rewriting rules work. Written by Brian Costales, the author of the best sendmail book around, "Sendmail", published by O'Reilly and Associates.
Kai's SpamShield
Sendmail add-on that provides rate control and volume limits for Unix-based mail servers. Can stop spam from ISP's own customers, and mail bombers.
Linux-Sec.net
Features minimum mail server hardening recommendations. Includes information on how to do it, antispam, filtering, open relay, antivirus, and statistics analyzer.
Scaling Sendmail
Tips on how to improve sendmail throughput for use in large scale installations.
Sendmail Forum at Tek-Tips
Sendmail technical support forums and mutual help system for computer professionals. Selling and recruiting forbidden.
Sendmail V8: A (Smoother) Engine Powers Network E-
Excellent description of sendmail version 8 features.
Sendmail: Theory and Practice
Including how to order and the unofficial press kit.
Virtual Hosting with Sendmail
Gives some very rough hints about the things to do in setting up e-mail for a small domain or a single computer.