Making E-mail Identity Work

摘要

I've watched with bemusement as bill gateshas been making the rounds lately ― the World Eco-nomic Forum, the RSA Conference ― to announce that Microsoft is "innovating on many different fronts" to eradicate spam. Really? The hashcash scheme, which requires the sender to spend CPU cycles generating an ID number for each message, dates back to about 1992 or so (infoworld.com/1074). And "caller ID for e-mail" derives from RMX (Reverse MX), a more recent proposal to bind senders to authorized relays via DNS records.