Header Analyzer

Paste raw email headers to analyze the Received chain, SPF/DKIM/DMARC results and ARC status. Everything runs in your browser — nothing is sent to a server or stored.

Every email carries a hidden trail of every server it passed through, plus the authentication verdicts each one recorded — but reading raw headers by hand is tedious and error-prone. Paste a real message's headers (or drop a .eml file) and this tool reconstructs the delivery path, checks SPF/DKIM alignment, and flags anything unusual — entirely in your browser. Nothing is ever sent to our servers or stored.