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RFC1421 Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures Proposed Standard
RFC1422 Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key Management Proposed Standard
RFC1423 Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and Identifiers Proposed Standard

RIPEM (dir.html) An Implementation of Privacy Enhanced Mail
PreMail A Unix PGP client
Lakewood Secure Communications

MIT distribution site for PGP
PGP Mail Pretty Good Privacy from uu.net
PGP/PEM from NCSA
PEM Privacy Enhanced Email Archive from tis.com

Please send additions or changes to: wcw+andrew2@cmu.edu