Email Header Analyzer
Paste full message headers to inspect authentication results and message routing. The content is processed in your browser and is not submitted to our server.
What this analyzer can tell you
It extracts the authentication results reported by receiving mail systems, plus From, Return-Path, and Received hop counts. Email headers can be forged; the receiving provider's trusted Authentication-Results header is the most useful evidence. This tool does not validate a message cryptographically.
Need help with email authentication? Explore email deliverability support.
How to use this free Email headers checker
Message headers contain routing and authentication information recorded by mail systems. Enter the domain or URL above and review the returned records and status details. The results reflect the information available when the check runs.
Understanding your Email headers results
Authentication-Results headers can show SPF, DKIM and DMARC outcomes reported by the receiving infrastructure.
Treat copied headers as potentially sensitive and avoid sharing private message details unnecessarily.
Need help fixing a problem?
Read our Email headers support and troubleshooting service, explore other free diagnostic tools, or contact Remote IT Support for optional professional assistance.