Email Headers Checker

Paste raw headers to extract SPF, DKIM, DMARC and routing signals. Use test emails if possible.

You can paste the full block from Gmail: "Show original" -> "Copy to clipboard". The tool will auto-detect the headers section. Do not paste sensitive data. Use test emails when possible.

Guide

Extracted signals

FAQ

Where can I find Authentication-Results?
It is usually present in “View original” output and contains SPF/DKIM/DMARC verdicts.
What is the fastest way to confirm DMARC?
Look for dmarc=pass in Authentication-Results and compare with DNS policy.
Why do I see multiple Received lines?
Each hop adds a Received header, which helps trace routing and delays.
Does this tool send data anywhere?
No external calls are made. The analysis happens on the server to render this page.
What should I paste for best accuracy?
Paste the full raw headers block from your mailbox “original message” view.

Tip

If SPF passes but DMARC fails, check alignment: the SPF domain can differ from the visible From domain.

Next steps

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