Email forensics

Read an email's headers

Paste the raw headers of an email to trace the servers it passed through, the delay at each hop, where it really came from, and whether SPF, DKIM and DMARC passed. This runs entirely in your browser. Nothing is uploaded.

Look for "Show original", "View source", or "Internet headers" in your mail client.

What leaves your browser

Nothing. The headers you paste are parsed entirely in your browser with JavaScript and are never sent anywhere. Close the tab and it is gone. Verify in the source.