Private browser-based analysis
Email Header Analyser
Paste raw email headers to see who really sent the message, which domains authenticated it, and why DMARC passed or failed. Your pasted headers stay in your browser.
In Outlook or Gmail, use the option to view original/message source, then paste the headers above.
Your email data stays in your browser. Header analysis is performed locally and is not uploaded, stored or sent to an AI provider.