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Email metadata encryption

The challenge of encrypting email metadata, such as subject lines and routing headers

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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...

Feb 3, 2026

What legal standards govern access to ProtonMail Bridge and local clients versus webmail?

’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...