Email Header Decoder

Paste raw headers to parse Received hops and auth results client-side.

How it works

Paste raw headers — see auth + Received hops

Paste full headers from Gmail “Show original” (or Outlook) → click Decode headers → see From/Subject, SPF/DKIM/DMARC results, and hop list. Runs only in your browser.

Or start from a real-life example

Results appear here after you click Decode headers.

Ready to send with MailShrine?

New accounts get free signup credits. Fix the copy, then send from MailShrine.