Google encrypts Gmail between data centers to keep the NSA out of your inbox
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Further more, Google also mention that, All the message or data that you send or receive on to your mails, will be transferred as encrypted message internally on the Google servers, and well it will stored with the encrypted on the Google's data centers.
This changes may be brought down due to NSA activity, but Google haven't mention NSA on this and made a silence change on to its service. Earlier, Google directly denied that NSA had access to its servers, but with the more and more leaked details specifies that NSA had multiple initiative to collects data from Google.