📧Email Authentication Header Analyzer
Paste the raw source of an email you actually received to see exactly how it was authenticated: SPF and DKIM results, DMARC alignment, connection details, and the DMARC policy the receiving server observed — all parsed locally in your browser, nothing is sent to our servers.
How to get the raw source of an email
This tool reads the same headers your mail provider already computed when it received the message — Authentication-Results, DKIM-Signature, and Received — instead of trying to re-run SPF/DKIM/DMARC validation from scratch.
Gmail: open the email → the three-dot menu → "Show original" → copy everything in that page.
Outlook: open the email → the three-dot menu → "View" → "View message source".
Apple Mail: open the email → View menu → "Message" → "All Headers".
Unlike a live DNS lookup, this reflects what actually happened at delivery time — including the sending server's real IP address and the exact DMARC alignment result computed by your mail provider.