Email Header Analyzer

No. The Email Header Analyzer is a fully client-side utility. All data processing, calculations, and conversions are handled locally in your browser. No input text, payloads, or keys are uploaded to any external server.

Each mail server prepends its own `Received:` header to the top of the message as it passes the email along, so the topmost `Received:` header in the raw source is actually the most recent hop, and the bottommost is the original sender. This tool reverses that order so the displayed route reads chronologically, from Hop 1 (the original sender) to the final hop (your inbox).

The analyzer looks for an `Authentication-Results:` header and best-effort extracts `spf=`, `dkim=`, and `dmarc=` values from it using simple pattern matching. Not every mail provider includes this header, so a missing badge doesn't necessarily mean authentication failed — it just means the result wasn't reported in a recognizable format.

It's a diagnostic and forensic tool for tracing how an email traveled across mail servers, spotting unusual or spoofed `From`/`Return-Path` mismatches, and reviewing authentication results — useful when investigating phishing attempts or delivery delays.

No. The application runs entirely in browser memory. Once you refresh the tab, navigate away, or close the window, all inputted details, logs, and outputs are completely cleared.

Yes. The interface is optimized to be fully responsive. You can perform calculations, conversions, and formats on all modern mobile, tablet, and desktop web browsers.

Yes. Once loaded, all code and assets required to run the Email Header Analyzer reside in your browser cache, enabling offline use without an active network connection.