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Regarding your #3 point: http://support.apple.com/kb/HT4979

iOS supports S/MIME.

Just for completeness sake, there's also GPG for iOS as well: https://itunes.apple.com/us/app/opengp-lite/id405279153?mt=8

Fair enough, assuming that Intro breaks the S/MIME support (which I'm guessing that it does) then it adds the risk that users using S/MIME can't verify the integrity of mail in the app. So that's something else that S/MIME users should evaluate when judging the risks.

Do you work at/for/rendered services to LinkedIn in any way?

No. I have no relationship with LinkedIn other than as a user.

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