Google, Yahoo tighten spam filtering

Google and Yahoo are expanding their use of a successful system for identifying spam.

The move is part of years-long effort to implement a series of checks designed to figure out if an email really has been sent by the domain it purports to come from.

Email spoofing has long been a problem since it's easy to forge the "from" address, making it more likely the receiver will believe it came from a legitimate source.

By Nov. 2, Yahoo plans to be using DMARC (Domain-based Message Authentication, Reporting & Conformance) for its ymail.com and rocketmail.com services. Next year, Google also plans to move Gmail to a strict DMARC policy, according to a news release.

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