Email Header Analyzer

Free online Email Header Analyzer. No sign-up needed, and it runs in your browser.

Processed on your device

Paste email headers to see if SPF, DKIM and DMARC passed, where the message really came from, and where it was delayed.

How to get the headers — Outlook: open the email → File → Properties → Internet headers. Outlook on the web: ⋯ → View → View message details. Gmail: ⋮ → Show original. Nothing you paste leaves your device.

How to use

  1. Add your text or file.
  2. Adjust the options if needed.
  3. Copy or download the result.