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Email Tools

Email Header Analyzer

Analyze raw email headers to trace delivery hops and check SPF/DKIM/DMARC authentication results.

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Paste raw email headers below to trace delivery hops and check SPF/DKIM/DMARC authentication results - entirely in your browser.

Analyzed entirely in your browser - headers are never sent anywhere.

JustChecker builds tools that respect your data - this one never leaves your browser.

Frequently Asked Questions

No - this tool parses headers entirely in your browser using JavaScript. Nothing you paste is transmitted anywhere.

Most email clients have a "Show original" or "View source" option (usually in a message's menu) that reveals the full raw headers, not just the visible From/To/Subject fields.

Each "Received" header represents one server the email passed through on its way to you - reading them from bottom to top shows the actual delivery path.
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