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Definition: Proton Mail


An encrypted email service from Proton Technologies AG, Geneva, Switzerland. Proton Mail is accessible via the Web, desktop and mobile apps. It provides both end-to-end and zero-access encryption, which means the message content is secure in transit and also while stored on Proton Mail servers. The company does however cooperate with law enforcement on criminal investigations within the framework of Swiss laws. See encrypted email, end-to-end encryption and zero-access encryption.