tools/email-header-analyzer
What actually happened to this email?
Paste the raw headers below — you'll get the delivery path hop by hop with delays, the SPF / DKIM / DMARC verdicts, and the spoofing red flags. Everything runs in this browser tab; the headers are never uploaded anywhere. In Outlook: open the message → File → Properties → Internet headers. In OWA: ⋯ → View → View message details.
// tip: paste everything — partial headers give partial answers
message.txt
flags.log
route.trace — oldest hop first
Headers keep failing auth for your own domain? Run the domain itself through ./email-security-grade