Email header analyzer — trace the path and auth
Paste raw email headers and see the sender, the hops, and the SPF, DKIM and DMARC results. It analyses entirely in your browser (0 uploads, works offline).
How to use it
- Copy the full headers from your email client.
- Paste them here.
- Read the message summary, authentication results and received path.
FAQ
How do I read email headers for free?
Paste the raw headers and this page pulls out the From, To, Subject and Date, counts the Received hops, and reports the SPF, DKIM and DMARC outcomes from the Authentication-Results header — on your device with no upload.
Is it safe to paste headers from a real email?
Yes. Headers can reveal internal servers and routing, so they are parsed entirely in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi.
What do SPF, DKIM and DMARC tell me?
They indicate whether the sending server was authorised (SPF), whether the message was cryptographically signed and intact (DKIM), and whether it aligned with the domain's policy (DMARC). A fail is worth investigating for spoofing.
Where do I find the raw headers?
Most clients have a "Show original" or "View source" option; copy everything above the message body and paste it here.
Limits
Reads the results already recorded in the headers; it does not re-run SPF, DKIM or DMARC checks, which would need DNS lookups.
Related
The email address validator checks syntax; the user-agent parser breaks down a UA string.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.