Since, Gmail's launched in 2004, Goole supported email-signing standards such as DomainKeys and DomainKeys Identified Mail (DKIM) to help validate outbound mail with digital signatures.
Google now allows Apps customers to sign their outgoing messages with DKIM, so their sent mail is less likely to get caught up in recipients' spam filters at no extra cost.
Starting today, all Google Apps administrators can enable DKIM signing in "Advanced Tools" tab of the control panel. As more email providers around the world support DKIM signing, spam fighters will have an even more reliable signal to separate unwanted mail from good mail.
"We help the most-phished brands on the Internet manage their mail authentication programs, and Google Apps solution is the simplest that we've encountered. Configuring DKIM for in-house systems requires plug-ins or additional gateway servers, making a company's mail environment more complex and difficult to manage. As a Google Apps customer, this feature took us only a few clicks in the control panel and an update of our DNS," said Kelly Wanser, CEO of eCert.