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Email troubleshooting · Browser-only analysis

Make sense of an email’s headers.

See the authentication results and delivery path reported in a particular message. No signup, mailbox login or upload is required.

Paste the original headers

Use the message’s “Show original”, “View source” or “Message details” option. Paste the headers above the first blank line, rather than the email body.

Headers can contain personal addresses, internal hostnames and IP addresses. This analyser processes the text in this browser and does not upload or save it. Use Clear when finished, especially on a shared computer.

Technical references: Authentication-Results and email header format.