Agents with access to an email (Gmail MCP with messageFormat RAW, Gmail API format=raw, IMAP, or a browser "Show original") can generate a Redacted zero-knowledge proof on their own machine and get a shareable https://redacted.zk.email/verify?id=… link. The raw email is never uploaded; only the proof and the parts you chose to reveal are published.
Install: curl -fsSL https://redacted.zk.email/skills/redacted-email-proof/install.sh | sh
Instructions: https://redacted.zk.email/skills/redacted-email-proof/SKILL.md · Summary: /llms.txt · Source: https://github.com/zkemail/Redacted/tree/main/skills/redacted-email-proof
Verify a link from the command line: node ~/.redacted-prover/redacted.mjs verify "https://redacted.zk.email/verify?id=…" (checks the proof and that its DKIM key matches the sender's DNS).