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a system sending an e-mail message would embed a secure, private key in a message header. The receiving system would check the Internet's Domain Name System for the public key registered to the sending domain.
While it might seem that Yahoo would need essentially all of the world's e-mail systems on board with Domain Keys for it to work, Garlinghouse said the technology would work if even a few major providers adopt it."If we can get only a small percentage of the industry to buy in, we think it can have a dent," he said.
I don't get this... Wouldn't every legitimate email sender have to be using it?
It would require everyone who is running an outbound e-mail server to use this. I presume this would be the equivalent of a PGP signature of the e-mail by the server, rather than the sender of the e-mail. This would require that every e-mail server on the planet change their software. This idea has practical problems. This would be a major change to the current RFCs for e-mail.
