Analyze email headers to check SPF, DKIM, and DMARC authentication status. Troubleshoot email delivery issues and verify authentication.
How to get headers: In Gmail: Open email → Three dots → Show original. In Outlook: Open email → File → Properties → Internet headers.
Email headers contain metadata about the email including routing information, authentication results, sender details, and more. They're essential for troubleshooting delivery issues.
The Authentication-Results header shows SPF, DKIM, and DMARC check results. "pass" means the check succeeded, "fail" means it failed.
Received headers show the path an email took from sender to recipient. They're added by each server that handles the email, with the most recent at the top.
Gmail
Outlook
Pro Tip: If all authentication checks pass but emails still go to spam, check your content for spam triggers. Use our Email Checker to test your complete email setup with a live email.