Processing boundary
Input is processed only in the active browser tab's memory and is not sent to a ByteQuant server.
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Privacy & security
Email Header Analyzer
Parses folded header lines and summarizes Received order, From/Reply-To, and SPF, DKIM, or DMARC claims in Authentication-Results. It does not cryptographically verify signatures or guarantee sender identity.
✓ Free✓ No account✓ In-browser
Persistent storage
Input and output are not stored. The optional usage counter keeps only tool identity and count, never content.
Verification
Output comes from disclosed rules or browser APIs and needs independent review before high-impact use.
A result in three steps
- 01
Mask personal addresses if needed and paste headers.
- 02
Review the local summary and warnings.
- 03
Verify suspicious mail with your provider without opening links.
When is this tool useful?
- ✓ Phishing pre-review
- ✓ Delivery-route debugging
- ✓ Email education
Important limitation
Automated output is a preliminary assessment. Do not use it alone for legal, financial, medical, or security-critical decisions.
LEARN THE WORKFLOW
Guides for this tool
Using Local Design, Security, and Financial Planning Tools Responsibly
Keep boundaries visible from CSS prototypes and email/CSP review to financial scenarios and travel calculations.
Read guide →ABOUT THIS TOOL
Frequently asked questions
Does this tool send input to a server?+
No. Processing runs in this browser tab. Data leaves the page only when you choose to copy or download the result.
Is the result definitive?+
The tool produces consistent output from disclosed rules and browser APIs, but context, data quality, and method limitations can affect it. Verify high-impact decisions.
Is input saved?+
No. Tool input is not persisted. With consent, only tool identity and usage count may be kept on this device for personal shortcuts.