Re: Self Addressed Stamped Envelopes

If the remailer is willing to keep some state information around for a limited time, auto-reply can be even simpler: when a remailer forwards mail, it saves the return address and replaces it with a unique ID for that mail, which it creates and saves. The recipient can just use the 'reply' command of his mailer. When the remailer gets mail with this unique ID, it plugs in the old return address, encrypts the message to the new destination, and sends it along, retracing its original path. This does provide a weaker security guarantee than if the remailer _throws away_ the correspondence with input and output, though, so a slightly more complicated alternative is probably better. -- Marc Ringuette (mnr@cs.cmu.edu)