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Not sure how well received this will be here, but one of the most celebrated efforts at creating a useable PGP-based e-mail system – and one backed by significant venture capital money and even featured on Mr. Robot [securityaffairs.co] – has opened up for sign-ups. ProtonMail was previously in beta and had a significant waitlist but when I recently went to check for family member I had signed up, I had found that they recently opened up for public sign-up.