Generate the RFC 8058 unsubscribe headers Gmail and Yahoo demand. Free, no sign up.

100% free. No sign up. No sign in. Runs in your browser.

Generate the List-Unsubscribe and List-Unsubscribe-Post one-click headers required by Gmail and Yahoo for bulk senders sending more than 5,000 emails per day. Supports both POST URL and mailto fallback. Output is copy-pasteable directly into SMTP headers.

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