Google has taken a step to stop legitimate e-mail messages sent by its Apps customers from getting caught in spam filters.

Administrators for Google Apps can now enable digital signing of those messages, which helps recipients verify that the messages came from a known, vetted sender, wrote Adam Dawes, a Google Enterprise product manager on a company blog.

The system uses DKIM, or DomainKeys Identified Mail, which verifies the domain name through which a message was sent by analyzing the message's cryptographic signature. If the message comes from a domain that is considered reputable, it won't be filtered out.

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