ProtonMail is an encrypted e-mail service with over 1 million users. The ProtonMail secure e-mail app for iPhone and iPad brings easy-to-use e-mail encryption to your mobile device by seamlessly integrating PGP end-to-end encryption. ProtonMail also provides a modern user interface with a full set of innovative features, such as customizable swipe gestures and the ability to send expiring e-mails.
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