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When did the red unlocked icon start to appear in Gmail? I found it in some of my emails recently, but the icon actually also appears in the emails as further back as in July 2015.

Does it mean that emails before July 2015 which do not have a sign were encrypted? And if one's sent email was not encrypted today how could some of their emails before July 2015 be encrypted when they have been using the same email system?

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