Email Header Analyzer

Paste email headers to see delivery path, delays, TLS encryption and spam analysis.

ABOUT EMAIL HEADERS

Email headers are present in every email and contain important diagnostic information: delivery path, delays, anti-spam results and encryption. This tool makes them readable.

WHAT WE ANALYZE

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Delivery path

Every hop from sender to recipient

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Delays

Time per hop — find bottlenecks

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TLS encryption

Which hops use STARTTLS

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SPF, DKIM, DMARC

Authentication status per check

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Spam analysis

Spam score and why mail lands in spam

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Return-Path

Mismatch between From and Return-Path

HOW DO I FIND EMAIL HEADERS?

Gmail: Open the email → three dots → "Show original"
Outlook: Open the email → File → Properties → Internet headers
Thunderbird: View → Message source