Email Header Analyzer
Paste raw email headers to trace the delivery path hop-by-hop, check SPF/DKIM/DMARC results, and get a plain-English diagnosis of why email went to spam.
How to Get Email Headers
- Gmail — Open email → ⋮ menu → Show original → Copy to clipboard
- Outlook (Web) — Open email → ⋮ → View → View message source
- Outlook (Desktop) — File → Properties → Internet headers
- Apple Mail — View → Message → All Headers
- Thunderbird — View → Headers → All
- Yahoo Mail — ⋮ menu → View raw message
What This Analyzer Checks
- Routing path — hop-by-hop server trace with timestamps
- Delivery delay — where time was lost in transit
- SPF result — did the sender pass SPF authentication?
- DKIM result — valid cryptographic signature?
- DMARC result — policy pass or fail?
- Spam score — spam filter verdicts from headers
- Key headers — From, To, Reply-To, Subject, Message-ID, X-Mailer
Frequently Asked Questions
Gmail: open email → ⋮ → Show original. Outlook desktop: File → Properties → Internet headers. Apple Mail: View → Message → All Headers. Copy the entire block of text before the email body.
Check the Authentication-Results header in your analysis. If SPF, DKIM, or DMARC show "fail" or "none", that's the main reason. Also check for X-Spam headers that show a high spam score.
SPF pass means the sending server's IP is authorized to send email for that domain. It's checked by looking up the domain's SPF TXT record and verifying the sending IP matches.
DKIM (DomainKeys Identified Mail) is a cryptographic signature added to outgoing emails. The receiving server verifies the signature against a public key in DNS, confirming the email wasn't altered in transit.