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The use of Proton Bridge as a proxy for enabling end-to-end encryption with desktop mail applications
ProtonMail’s end-to-end encryption for desktop access is built around a proprietary protocol that requires the Proton Bridge proxy for third‑party clients, and reporting indicates there are no fully s...
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...
’s documentation establishes a clear technical divide: ’s web and mobile apps keep messages encrypted on the server with “zero‑access” end‑to‑end encryption, while decrypts messages locally and expose...