Email Tools

Email Header Analyzer

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

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

Paste raw email headers

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

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

What Is the Email Header Analyzer?

Every email carries hidden headers recording the servers it passed through and the results of SPF, DKIM and DMARC checks. Paste the raw headers and this tool lists the delivery hops and authentication results. It runs in your browser.

When to Use It

When an email went to spam and you want to know why.
To check whether a suspicious email really came from the sender it claims.
To find delays between servers.

How to Use It

Copy the full headers (Gmail: "Show original"; Outlook: "View message source").
Paste them and analyse.

Understanding the Result

Received headers are read bottom to top - the first hop is at the bottom. In Authentication-Results, spf=pass, dkim=pass and dmarc=pass are what a genuine email from a well-configured domain should show.

Limitations

Headers added before the email reached a trusted server can be forged, so rely on the results added by your own mail provider.

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.