Gmail jibes with Yahoo to fight spam

Google's free e-mail service, Gmail, has begun using antispam technology supported heavily by archrival Yahoo.

Messages from Gmail sent Monday indicated that they were encoded with DomainKeys technology, as evidenced by logs in the message headers. When an e-mail header from a Gmail message was opened, a code reading "DomainKey-Signature" appeared.

DomainKeys is a technology backed by Yahoo that tries to cross-check e-mail messages to verify their origination. The idea is to thwart e-mail "spoofers," which are spam messages that pretend to be from legitimate Internet addresses. These spoofed e-mails often pass through spam filters and fool recipients into opening the messages.

"We are encouraged by the adoption of DomainKeys and believe it is a key step in furthering the industry's fight against spam and e-mail forgery," Yahoo spokeswoman Mary Osako said. "Spam is an industry issue, and we believe collaboration with the Internet community is vital in solving the authentication issue."

A representative from Google was not immediately available for comment.

DomainKeys is a proposed system that attaches encrypted digital tags to each e-mail, then compares them to a public database of legitimate Internet addresses. Once the message arrives, the database and message keys need to match in order to pass into an e-mail in-box.

Yahoo is not the only Web giant to propose an antispam system. Microsoft has been pushing Sender ID, which verifies the authenticity of the sender's "@" address by checking the message's numeric Web address. Sender ID blends Microsoft's proprietary "Caller ID for E-mail" with another technology, called Sender Policy Framework, or SPF.

America Online has put its weight behind SPF and has begun installing the system into its e-mail servers. The online giant recently stopped testing SenderID after standards bodies and the open-source community pulled their support and criticized Microsoft for keeping the technology under a shroud of secrecy. AOL is still testing DomainKeys, which works in concert with SPF or SenderID.

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