Why did your email land in spam? Free header analyzer. No sign up.

100% free. No sign up. No sign in. Runs in your browser.

Paste any email's raw headers. The analyzer extracts the authentication verdicts (SPF, DKIM, DMARC), the sending path through every Received hop, the Message-ID, From/To/Subject, and verifies RFC 8058 List-Unsubscribe + one-click compliance.

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