Paste an email’s raw headers to inspect the visible From, Reply-To and Return-Path domains, reported SPF/DKIM/DMARC results, and the number of Received hops. Everything is checked in this page; no links are opened and no message is sent anywhere.
A signal check, not a verdict. A “pass” is only a claim found in the pasted headers, not an independent verification or proof that a message is safe. Headers can be incomplete, altered or copied from the wrong place. Don’t open unexpected links or attachments based on this report.
Paste headers, then choose Inspect headers.
Most mail apps offer a message menu such as “Show original”, “View source” or “View message details”. Copy the header section only if possible. Headers can contain email addresses, server names and IP addresses, so remove anything you do not want to paste into this page or share in a report.