Email Header Analyzer
Paste raw email headers to trace routing, check authentication, and detect delays. 100% client-side.
What are Email Headers?
Email headers contain the technical details of a message's journey from sender to recipient. They include routing information (Received headers), authentication results (SPF, DKIM, DMARC), and metadata like Message-ID and return path. Analyzing headers helps diagnose delivery issues, detect spoofing, and understand email infrastructure.
How to find email headers
- Gmail: Open email → ⋮ menu → Show original
- Outlook: Open email → File → Properties → Internet headers
- Yahoo: Open email → ⋮ menu → View raw message