Header Analyzer
Paste raw email headers to extract sender identity, authentication outcomes, and a simple view of the routing path.
How this lookup works
Email headers often contain the fastest clues for sender authentication and routing investigations.
What it checks
- Authentication-Results, Received-SPF, and DKIM-related headers where present.
- Sender-related fields such as From, Return-Path, Reply-To, and Message-ID.
- Received headers to estimate visible mail hop count.
Why it matters
- Authentication failures often explain spam placement, rejection, or spoofing alerts.
- Domain mismatches can point to forwarding, third-party platforms, or impersonation.
- Long or unusual routing paths can highlight relay, forwarding, or delivery issues.
Common issues
- Missing or partial authentication data.
- From and Return-Path domains that do not align.
- SPF, DKIM, or DMARC failures visible in Authentication-Results.