Email header analyzer
Paste a message's raw headers to see where it came from, whether it passed SPF, DKIM, and DMARC, and what looks off. Nothing leaves your browser.
Gmail: More › Show original. Outlook: File › Properties › Internet headers. Apple Mail: View › Message › All Headers.
Private: runs in your browser
This tool runs entirely on your device. What you enter isn't sent to this site or to any other service, and nothing is kept after you leave the page.
Headers can include names, addresses, and internal hostnames. They're read on your device only.