Email header analyzer
Understand the route and authentication signals behind a message.
Paste raw email headers
Authentication summary
Paste headers and press Analyze. Nothing is uploaded: parsing runs in your browser.
These are results the receiving server wrote into the headers. We do not re-verify them, and display names can still mislead.
Headers can hold private addresses and IPs. They stay in your browser. Relay timestamps can be wrong, and this is not proof of spoofing. A hop is marked Review when it is over 5 minutes or goes backwards in time.