What is the Authentication-Results header?
Authentication-Results is an email header recording authentication check outcomes. It shows whether SPF, DKIM, and DMARC passed or failed for the message, providing recipients visibility into authentication status.
Format includes: authenticating server identity, individual check results (pass/fail), and details about what was checked. Example: "spf=pass smtp.mailfrom=example.com; dkim=pass header.d=example.com; dmarc=pass".
Usage: troubleshooting authentication issues, verifying proper configuration, and understanding why messages might be filtered. Check this header when investigating deliverability problems.
Understand the "why" behind email authentication. Open an AI assistant with your question pre-loaded — just add your details and send.
Was this answer helpful?
Thanks for your feedback!