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Open toolEmail Header Analyzer
Read unfolded email headers and recorded delivery hops. Inspect authentication claims as pasted text; this page does not independently verify SPF, DKIM or DMARC.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Analyze headers.
Your result
Enter your details
Result will appear here
How Email Header Analyzer works
Parse header fields, show Received lines in delivery order, and display recorded authentication results.
Processing uses bundled libraries in this browser. The result table shows the supported checks; it does not query another service.
How to analyze headers
Start with the supported input, then check the generated result.
Enter the source details
Use Raw email headers. The form starts with an example you can replace.
Input and settings
Check the input settings
Read the supported input format and size limits before submitting.
Tool result
Read the result table
Read each reported path or recorded value. A clean table only covers the checks described on this page.
Review the details
When to use Email Header Analyzer
These workflows use the formats and behavior supported by this implementation.
Read folded header fields
Continuation lines are unfolded into their preceding fields. Paste the header block rather than the message body.
Follow recorded delivery hops
Received lines are shown in recorded delivery order, with the oldest recorded hop first. A pasted header cannot prove the route was authentic.
Inspect authentication claims
Inspect recorded Authentication-Results values as claims. Independently verifying SPF, DKIM or DMARC requires checks this page does not perform.
What the check result contains
Keep the output format and conversion policy in view.
An unfolded header table and Received-hop details. Parse header fields, show Received lines in delivery order, and display recorded authentication results.
Compare the result with the original before replacing a source file. Conversion limits are listed below.
Supported input and limits
Check these conditions before relying on the result.
Only analyzes the pasted headers. Authentication-Results can be forged; SPF, DKIM and DMARC are not independently verified. No DNS, IP location or mailbox request is made.
Input and results are not stored after leaving or reloading. Keep the original and download any output you need.
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Email Header Analyzer: common questions
Answers about using Email Header Analyzer and understanding its results.
What does this tool produce?
It produces an unfolded header table and Received-hop details. Only analyzes the pasted headers. Authentication-Results can be forged; SPF, DKIM and DMARC are not independently verified. No DNS, IP location or mailbox request is made.
Is my input uploaded?
Processing runs in this browser with local bundled libraries. No input is sent to a conversion server. Download your result before leaving the page.