A brief filed by Google’s attorneys has surfaced and revealed that Gmail non-Gmail users who exchange emails with a Gmail user should have “no legitimate expectation of privacy” The brief, unearthed by Consumer Watchdog, was filed on July 13, 2013 in response to a class action complaint against the company to the United States District Court for Northern District of California. Google emphasizes the more practical purposes of the questionable privacy policy; every time you type in keyword or run a search filter, in order to pilfer through your messages, Google has to scan the actual email.”]
Source: https://gizmodo.com/google-gmail-users-have-no-reason-to-expect-privacy-1126390598