Spam Resources

Tools

Sophos Pure Message: http://www.sophos.com/; Sophos is a vendor of tools for "integrated threat management" for business customers. I often see the company mentioned in articles on computer threats like spam, viruses, and spyware.
SpamAssassin: http://spamassassin.apache.org/; The Apache SpamAssassin Project is an open source spam filter, often used at the server level by ISPs and businesses.

SpamCop Home: http://www.spamcop.net/; Describes itself as "the premier service for reporting spam." It is a powerful tool and in the vanguard fighting spam.
SneakEmail.Com: http://www.sneakemail.com/; Service allows you to create temporary email addresses for online registrations, etc.
SpamBouncer: http://www.spambouncer.org/; Unix spam filter that works with procmail

Handling Spam: A Review of Options: http://homepage.mac.com/corrp/macsupt/spam/spamoptions.html
TechnoMom's Tips on Handling Spam (Start here!): http://www.technomom.com/cynthia/antispam/index.html
Legal Effort to Recover Spam Costs [TidBITs]: http://db.tidbits.com/getbits.acgi?tbart=06458

Procmail: Order from Chaos with Procmail: http://sysadmin.oreilly.com/news/procmail_1200.html
Perl: "My Life With Spam" Mark Jason-Dominus articles: http://perl.plover.com/lp/Spam.html; http://www.perl.com/pub/2000/02/spamfilter.html; http://www.perl.com/pub/2000/03/spam3.html
Perl: "Filtering Mail with Mail::Audit and News::Gateway", by Simon Cozens (Perl tutorial): http://www.sysadminmag.com/tpj/issues/vol5_2/
Apache: "Save Your Site From Spambots": http://www.webtechniques.com/archives/2001/08/champeon/

Stopping Spam: Stamping Out Unwanted Email and News Postings: http://www.oreilly.com/catalog/spam/
The Procmail Companion by Martin McCarthy: http://procmail.non-prophet.org/