What information does it contain?
Authentication method results: **SPF** status (pass, fail, softfail, neutral), **DKIM** verification results (pass, fail, none), and **DMARC policy** evaluation. Each includes relevant domain or identifier.
Additional details: which server performed authentication, specific failures (e.g., signature mismatch), and policy applied. Some receivers add proprietary extensions with additional information.
Multiple headers: messages may have multiple **Authentication-Results** headers from different servers in the delivery chain. Each represents that server's evaluation point.
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