Gmail Will Warn Recipients of Unencrypted Messages

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Gmail will start notifying users when email in their inbox was sent over
an unencrypted connection. The change will be rolled out over the next
several months. Google hopes the practice will encourage the use of
encryption and strong authentication.
http://www.darkreading.com/endpoint/google-study-finds-email-security-a-mixed-bag/d/d-id/1323147?