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Proton Mail encryption

Proton Mail and Thunderbird encryption capabilities and limitations for sending encrypted emails to non-ProtonMail recipients

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Feb 6, 2026

Does using ProtonMail Bridge retain end-to-end encryption and zero-access guarantees?

Mail Bridge is designed to let desktop email clients work with Proton Mail while preserving Proton’s (E2EE) and zero-access guarantees: the Bridge decrypts and encrypts mail locally on the user’s devi...