Email Headers Analyzer · free
Email headers analyzer
Paste the raw headers from any email and see the routing path, authentication outcomes, and every header — decoded and organized. Nothing is uploaded; parsing runs entirely in your browser.
Paste raw headers — stops at the first blank line
How to copy headers from your mail client
Gmail: open the message → three-dot menu → "Show original". Copy everything above the blank line that separates headers from the body.
Outlook (web): message → three-dot menu → "View → View message source".
Apple Mail: View → Message → All Headers (⌥⌘U).
For context on what SPF, DKIM, and DMARC results mean, see our 2026 authentication guide.
Need this in production?
The free tool is great for one-off checks. For automated monitoring, alerting, and an API, see the related Postscale product.
See the Transactional Email API