Gmail Postmaster Tools
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The Gmail Postmaster Tools help qualified high-volume senders analyze their email, including data on delivery errors, spam reports, and reputation. This way they can diagnose any hiccups, study best practices, and help Gmail route their messages to the right place. For you, this means no more dumpster diving for that confirmation code
http://gmailblog.blogspot.com.au/2015/07/the-mail-you-want-not-spam-you-dont.html
http://betanews.com/2015/07/09/google-launches-gmail-postmaster-tools-to-eliminate-spam/
