Spam Filtering
Alcor On-Line Help: catching spam with procmail, Configuring procmail with TDG, Foiling Spam With Email Password System, Installing the Procmail Filters Kit, junkfilter: Junk Mail Filtration with Procmail, Procmail Spam Filter: The Spam Bouncer, SpamCop - FAQ, Uwanted Bulk E-Mail Trapping
Tutorials
Debugging Procmail Recipes: Some Tips, Getting Started With Procmail: A Tutorial for Begi, Procmail How-To Page, procmail workshop Oct 4, 1998
Automatic PGP Key Retrieval in Procmail
Use procmail to automatically extract PGP keys from incoming mail messages.
Cameron Laird's Personal Notes on Procmail
Discusses positive uses.
Filtering Mail FAQ
A general introduction to mail filtering on Unix, with information about Procmail, filter, and mailfilter. (Slightly old and apparently no longer maintained, but still an excellent introduction.)
ii.com: Processing Mail with Procmail
Procmail description and links to procmail program, documentation, and discussion groups.
ii.com: Procmail Quick Start
This article will quickly get you up and running with Procmail. By Nancy McGough, of Filtering FAQ fame. (Contents are partially the same as in the Filtering Mail FAQ, too.)
Mailagent ftp directory (Perl/Unix)
Contains the mailagent package itself. This is a Unix mail filter (a la filter, vacation, or procmail) written in Perl. Last updated sometime in 1997 ...
Procmail and PGP
Instructions for installing and configuring procmail and PGP for mail encryption and decryption..
Procmail FAQ
A mail processing utility which can help filter mail, sort incoming mail according to sender, Subject line, length of message, keywords in the message, implement and an ftp-by-mail server.
Procmail FAQ (cover page)
Contains the FAQ, a links collection, and Quickref
Procmail FTP Site
Mirror site for downloading Procmail; used to be the primary master site so is likely to be reasonably up to date if ftp.procmail.org is down
Procmail Mailing List Archive
Searchable MHonArc archive of the Procmail mailing list -- goes back to 1995
Procmail Quick Reference Guide
A quick reference to Procmail's recipe syntax.
Procmail recipe generator
Tk-RED is a procmail recipe generator. It uses a custom language Reciproc. It exports this language to a procmailrc file. Tk-RED is a graphical editor for writing recipes.
Timo's Procmail Tips And Recipes
A collection of useful tips on using Procmail.