Sendmail.org has some pretty good documentation on their own product.
I would like to suggest QMail instead of Sendmail if you have a choice in the matter. Life With QMail is an online free book for building and configuring QMail. QMail is quickly becoming the MTA of choice. Mainly because it is more secure than Sendmail.
Aw, come on Gregg, there are currently only two "critical security problems" listed on the sendmail.org home page. That's actually pretty good for them
I would second ignoring Sendmail (indeed - do an rpm -e on the thing). However I'm a fan of Postfix myself. Postfix is included with RH9 and Fedora. You don't state what distro you're using but it is easy to compile too.
Note that I have not personally used QMail so I don't have an opinion on it. [ October 26, 2004: Message edited by: Scott Dunbar ]
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