Mail headers
Mail header analyzer
Paste a message’s headers (Received, Authentication-Results, and so on), and we show its path and the SPF, DKIM and DMARC results.
Processing happens only in your browser: we send nothing to a server.
This page sends nothing anywhere: your browser parses the headers and keeps them in the tab.
What we show
- SPF
- Whether it passed, and which address the mail was sent from.
- DKIM
- Whether the signature is valid, the selector and the signing domain.
- DMARC
- Whether SPF and DKIM align with the domain in the “From” field.
- Message path
- Which servers the message passed through and how long each hop took.
Frequently asked
Where do I get a message’s headers?
In Gmail — “Show original”; in Outlook — “Message details”. Copy the whole text and paste it here.