Dependency-free double-opt-in confirmation tokens + one-click (RFC 8058) unsubscribe headers. Web Crypto only, runs on Cloudflare Workers with no nodejs_compat.
serverless email edge newsletter hmac web-crypto opt-in cloudflare-workers zero-dependencies double-opt-in one-click-unsubscribe rfc8058 list-unsubscribe confirmation-token
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Updated
Jul 2, 2026 - JavaScript