Sendmail Consortium
- The open-source version of the most popular SMTP server. Downloads and documentation.
A First Guide for E-mail Installation
- A draft about the installation/configuration of sendmail.
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.
Linux-Sec.net
- Features minimum mail server hardening recommendations. Includes information on how to do it, antispam, filtering, open relay, antivirus, and statistics analyzer.
MeTA1
- MeTA1 is a successor of Sendmail X. Release notes, documentation, source code and contact information.
Sendmail FAQ
- Frequently asked questions about sendmail.
Sendmail Inc.
- Commercial Sendmail products and services.
Sendmail V8: A (Smoother) Engine Powers Network E-mail
- Article on sendmail version 8 features. Mostly of historical value.
Tek-Tips Sendmail Forum
- Technical support forums and mutual help system for computer professionals. Selling and recruiting forbidden.