Where to find the original headers
Open the message in your receiving mailbox and look for “Show original,” “View source,” or “Message details.” Copy the header block at the top, including Authentication-Results. The body is not needed.
A forwarded copy may describe the forwarding hop. Use the original received message when possible, and identify which receiving system added each result.
Read a result without overclaiming
This tool reads the SPF, DKIM, and DMARC results a server recorded. It does not re-run SPF against an IP, verify DKIM cryptographically, or decide whether a message reached the inbox. It keeps separate Authentication-Results fields separate.
Headers can be forged. Trust only fields added by your receiving infrastructure. The analyzer omits authentication-looking text inside comments and ignores the message body.
What happens to pasted headers?
Parsing happens entirely in your browser. The input is not uploaded, saved to browser storage, or included in usage counters. Clear the field or close the tab to discard it.