Email Header Analyzer
Parse raw email headers into readable fields, the full delivery path and SPF/DKIM/DMARC results. Free email header analyzer with an AI plain-English summary.
Analyse email headers
Paste the full raw headers (use "Show original" in Gmail or "View source" in Outlook).
What this header analyzer does
Common use cases
- 1Investigating a suspicious or phishing email
- 2Confirming a message passed authentication
- 3Tracing where an email was delayed
- 4Finding the true originating server and IP
- 5Debugging deliverability complaints
- 6Teaching how email routing works
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About email headers
Every email carries headers — metadata added by each server that handles it. The Received lines record its journey (newest first), while Authentication-Results records whether SPF, DKIM and DMARC passed at the receiving server.
Reading headers by hand is tedious. This analyzer unfolds them, orders the delivery path oldest-to-newest with per-hop delays, and surfaces the authentication verdicts so you can quickly judge whether a message is genuine and where it slowed down. Analysis runs in your browser; the optional AI summary is the only thing sent anywhere.
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Got Questions? We Have Answers.
What does the email header analyzer show?
It unfolds the raw headers and extracts From, To, Subject, Date and Message-ID, rebuilds the Received delivery path with per-hop delays, and surfaces the SPF, DKIM and DMARC authentication results.
How do I get the raw headers?
Use "Show original" in Gmail or "View source" / "View message source" in Outlook and most clients, then paste the full text into the tool.
How do headers reveal a phishing email?
Failed authentication, a From that does not match the sending server, or an unexpected originating IP are red flags the analyzer highlights.
What are the Received headers?
Each server that handles a message prepends a Received line recording where it came from and when. Read newest-first, they trace the full delivery path.
Is my pasted email uploaded?
No. Headers are parsed entirely in your browser; only the optional AI summary sends a short digest to the AI helper.
What does the AI summary add?
It translates the technical results into plain English — whether the mail is authenticated, where it travelled and any anomalies worth investigating.