[ Free tool · Analyze ]
Email Header Analyzer
Paste a message header and see why it passed or failed DMARC.
[ About this tool ]
This email header analyzer parses raw message headers to show SPF, DKIM and DMARC results, alignment and each delivery hop.
How to read the results
- ›Authentication-Results shows the receiver's verdicts.
- ›dmarc=pass needs an aligned SPF or DKIM pass.
- ›Large gaps between Received hops indicate delays.
Frequently asked questions
How do I view email headers?
In Gmail use More > Show original; in Outlook open the message and choose View > Message source or Properties.
Is it safe to share email headers?
Headers include addresses and IPs, which is why this tool processes them only in your browser.
Learn more in our guide: Email Deliverability: How to Reach the Inbox, Not Spam
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