Tony Finch <[EMAIL PROTECTED]> writes: > I'm currently working on a scheme for cryptographically signing > envelope return paths to protect against forgery in general, and > collateral spam etc. as a consequence.
These schemes already exist and have been discussed (and used by some folks). I've tried it myself. The problem is many mailing lists doing sender verification barf all over it ... like this one. That being said, I'm a fan of the idea. Daniel -- Daniel Quinlan http://www.pathname.com/~quinlan/
