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Email Header Analyzer

Analyze email headers to trace routing, check authentication (SPF, DKIM, DMARC), identify delivery delays, and debug email issues. Paste headers from any email client.

AI Email Header Analyzer

Get AI-powered insights into your email's journey

Powered by Gemini

What can you learn from email headers?

  • Trace the path your email took through servers
  • Check SPF, DKIM, and DMARC authentication results
  • Identify delivery delays and their sources
  • Verify the original sender and detect spoofing
  • Debug email delivery issues

About this tool

Email headers tell the complete story of your message's journey. This analyzer helps you diagnose delivery problems by showing authentication results for SPF, DKIM, and DMARC. If you see authentication failures, use the appropriate record checker tool to fix your configuration, then verify propagation with our DNS propagation checker. If your mail server's IP is listed, check our blacklist checker for delisting options.

Frequently Asked Questions

In Gmail: Open email → click ⋮ menu → 'Show original'. In Outlook: Open email → click ⋮ → 'View message source'. In Apple Mail: View → Message → All Headers.

SPF/DKIM/DMARC results show if the email passed authentication checks. 'Pass' means verified, 'fail' means it failed verification, 'softfail' is a warning but not a hard failure.

Each server that processes your email adds a 'Received' header with a timestamp. Delays can occur due to spam filtering, greylisting, server load, or network issues.

Check that SPF, DKIM, and DMARC all pass. Look for unusual delays (>30 seconds between hops). Verify the 'From' address matches expectations and trace the path for any suspicious servers.

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