Mail Header Analyzer
Paste raw e-mail headers and analyze them clearly: SPF/DKIM/DMARC result with failures highlighted, delivery route with per-hop delays and all fields - entirely in your browser, nothing is uploaded.
No valid headers detected. Please paste the full header block (e.g. in Gmail: "Show original").
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Authentication
Delivery route
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from bywith Delay: (slow)
Key fields
All headers
How it works
- Paste the raw e-mail headers (e.g. Gmail "Show original")
- Read the SPF/DKIM/DMARC result at the top
- Check the delivery route and key fields