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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