Email Header Parser

Paste a raw email header and turn the delivery path, authentication verdicts, and filtering clues into something you can actually read.

I built this for the part of email troubleshooting that usually starts with a wall of headers and too much scrolling.

Everything runs in the browser. Paste the headers—or drop a .txt or .eml file—and the tool reconstructs the delivery path, explains SPF, DKIM, DMARC and ARC results, and points out the signals that may have sent the message to Junk. Nothing is uploaded.

It also keeps the useful evidence close at hand: each hop, the checks performed there, plain-English explanations for known headers, and a report you can copy into a ticket.