Inspect authentication results from a trusted receiver
Authentication-Results headers can show SPF, DKIM and DMARC outcomes recorded by a receiving system. Trust results added by the destination you control, since earlier headers can be forged.
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Free public analyzer
Email header analyzer
Paste message headers to inspect authentication results, routing and useful security signals. Header contents are processed in memory and are not stored.
Your result will appear here.
Run the check to see structured findings, severity, evidence and next steps from the public diagnostics API.
The details
Inspect authentication results from a trusted receiver
Remove sensitive content before sharing
Headers can contain email addresses, internal routing names and identifiers. The public endpoint processes headers in memory; avoid pasting message bodies or secrets.
A result is a point-in-time check
DNS can vary by resolver and change over time. Verify important changes with your DNS provider and mail platform. Public DNS checks cannot see every private report or sending configuration.
Explore MailConfig ProFrequently asked questions
What does the Email header analyzer do?
Paste message headers to inspect authentication results, routing and useful security signals. Header contents are processed in memory and are not stored.
Do I need an account?
No. This public tool is available without registration.