Automatic PGP Key Retrieval in Procmail
Use procmail to automatically extract PGP keys from incoming mail messages.
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.)
Procmail and PGP
Instructions for installing and configuring procmail and PGP for mail encryption and decryption..
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.