Email Header Analyzer
Paste an email’s raw headers to see how it authenticated — SPF, DKIM and DMARC — plus the full delivery path, delays and sending IP. Everything is parsed in your browser.
🔒 Private: parsing happens entirely in your browser. Your headers are never sent to our server.
How to get the raw headers
- Gmail: open the message → ⋮ menu → “Show original”.
- Outlook: open the message → File → Properties → “Internet headers”.
- Apple Mail: View → Message → All Headers.
What it tells you
- SPF / DKIM / DMARC — pass or fail, from the receiving server’s Authentication-Results.
- Delivery path — every hop from origin to your inbox, with the delay at each step (useful for diagnosing slow delivery).
- Sending IP and the core message fields.
Why did my email go to spam?
The most common cause is failing authentication. If SPF, DKIM or DMARC shows anything other than pass, fix that first — check your SPF and DMARC records on the sending domain.
Related tools
Frequently asked questions
▸ ▾ Are my email headers uploaded?
No — headers are parsed entirely in your browser and never sent to a server.
▸ ▾ What can the headers tell me?
The SPF, DKIM and DMARC results, the delivery path (each hop), the originating IP and timing — useful for debugging why a message was flagged.