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.