Email Header Analyzer (MailboxInsights)

Paste email headers and see SPF, DKIM, DMARC results and every delivery hop.

Free

Email Header Analyzer (MailboxInsights) website

About

A free email header analyzer. You paste the raw headers from any message and it shows SPF, DKIM and DMARC pass or fail, the full delivery path with the delay at each hop, and warnings such as Reply-To mismatches or failed alignment. The checks run in code, and AI only writes a plain-English explanation of the results. Nothing you paste is stored. Useful for phishing triage, deliverability troubleshooting and IT helpdesks.

Features

SPF, DKIM and DMARC pass or fail
Full delivery path with delay at each hop
Reply-To mismatch and alignment warnings
No signup, nothing stored

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