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"Why is this message in spam? It's a question we find ourselves asking our Gmail boxes almost daily, when messages that really should have made it through to the inbox end up in electronic purgatory instead. So why does Google's algorithm choose to filter certain legitimate messages, while letting the vast majority arrive unscathed? The answer can now be found atop each message filed as spam, presented with the simplest of explanations, that generally fails to provide any actual insight as to the email's assigned delivery. Such worthless gems as \"It's similar to messages that were detected by our spam filters,\" \"It contains content that's typically used in spam messages\" or \"Many people marked similar messages as spam\" now await you above each note -- seemingly assigned just as casually as the emails themselves."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/03/20/google-adds-spam-explanation-to-gmail/?ncid=rss_truncated>