Proton Mail

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World's largest secure email service releases version 2.0 under open source
license

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ProtonMail's front end encryption is completely open source and uses the
OpenPGPjs library.

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High security email service dramatically accelerating development to meet
immense demand.

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In this article we explain the difference between Login and Mailbox passwords.

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Proton Mail’s crowdfunding campaign has surged past $500,000 with the support of
over 10,000 backers.