Free Local utilities
Email header reader
Paste raw email headers to unfold fields and inspect Received and Authentication-Results entries. These entries can be forged; this tool does not verify signatures or establish trust.
Bookmark
Use your browser’s bookmark command to save this page. It saves the tool link, not your inputs or results.
Only the tool link is copied. Inputs and results are never included.
Your inputs
Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.
Text input: up to 256 KiB. Results are cleared when you leave the page.
How it works
Continuation lines are joined to the previous field. Reading stops at the first blank line, so an email body is not included in the result.
Assumptions and limitations
Up to 256 KiB and 1,000 fields. This reads syntax only: it does not authenticate senders, validate SPF/DKIM/DMARC, trace routes or prove the reliability of Received/Authentication-Results headers.
How to use this tool
Paste only the raw header block and Analyze. Inspect unfolded field values locally; remove identifying information before sharing any output. Paste headers or open a local email/text file. Choose header groups, a name filter, ordering, row limit and text/JSON output. Duplicate fields stay separate. The body is always excluded.
Worked example
Demonstration data only. Loading an example replaces the inputs but does not run the tool.
Received: from mail.example.com by inbox.example.com → Received: from mail.example.com by inbox.example.com
Frequently asked questions
What should I check before using this result?
Up to 256 KiB and 1,000 fields. This reads syntax only: it does not authenticate senders, validate SPF/DKIM/DMARC, trace routes or prove the reliability of Received/Authentication-Results headers.
Are my inputs or results saved automatically?
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Processing and privacy
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Privacy PolicyHelp
Paste only the raw header block and Analyze. Inspect unfolded field values locally; remove identifying information before sharing any output. Paste headers or open a local email/text file. Choose header groups, a name filter, ordering, row limit and text/JSON output. Duplicate fields stay separate. The body is always excluded.
Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.
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