Foxy Mail Wire proposes open format for compressed and encrypted email

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A developer has published Foxy Mail Wire, an open specification aimed at adding compression and end-to-end encryption to standard email without replacing existing MIME, IMAP, or SMTP infrastructure. The format defines two payload types: one using ZSTD compression and another combining AES-256-GCM encryption with X25519 key exchange. Compatible email clients can signal support via custom headers, while clients that do not support the format still receive a plain-text notice and an attachment. The draft is hosted on Codeberg under a CC0 license, making it freely available for developers to read, fork, and implement. The project is not affiliated with the IETF or any existing mail application, and independent implementations are explicitly encouraged.

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ProgrammingDEV Community ·

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