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How does the Gmail unsubscribe button work? - Anthony Critelli

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Every place a page here uses this source, in the order the words come in it.

  1. List-Unsubscribe-Post — Defined in RFC 8058, this header must contain the key/value pair of List-Unsubscribe=One-Click. “The List-Unsubscribe-Post header is important because it tells email clients that the list supports one-click unsubscription.” Press enter or click to view image in full size

    In Unsubscribe mechanisms

  2. This RFC and the related RFC 2369 discuss two important headers: “List-Unsubscribe — Defined in RFC 2369, this header describes the “command” to remove yourself from a mailing list.” List-Unsubscribe-Post — Defined in RFC 8058, this header must contain the key/value pair of List-Unsubscribe=One-Click.

    In Unsubscribe mechanisms