Email Header Analyzer
Parse email message headers to trace routing and authentication
About
Paste a block of email message headers to decode them. Shows key fields (From, To, Subject, Date, Message-ID), the Received hop chain (in delivery order, newest first), and SPF/DKIM/DMARC authentication results from Authentication-Results. Everything runs in your browser; nothing is uploaded.
About this tool
Parse email headers to trace the Received hops and check SPF, DKIM and DMARC results. Find delays and auth failures. Free, client-side, no signup. Email Header Analyzer runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- Email Header Analyzer is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use Email Header Analyzer?
Open Email Header Analyzer, enter or paste your input, and copy the result. The page works without an account.
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