Yahoo Submits DomainKeys to IETF: Six months after first announcing their plans, Yahoo! has submitted a spec for “DomainKeys” to the Internet Engineering Task Force for approval as a standard. Good for them.
DomainKeys is a way of authenticating email senders, using public and private key pairs and the domain name system, to give email-handling software better information with which to make spam filtering decisions.
The idea is that organizations create their own key pair and publish the public key in their DNS records. Outgoing email, including the headers, would be signed with the private key, and recipients would be able to verify the signature by looking up the public key.