Canonical: https://www.sdcom.co.za/email-header-analyser
Text snapshot: 2026-10-31

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Email troubleshooting · Browser-only analysis

# Private Email Header Analyser

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.

Email headers

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.

Analyse headersTry a fictional exampleClear

## Still unsure why a message failed?

We can review the original message with the receiving provider and check the sending service. This tool reads reported evidence; it does not independently verify signatures or decide whether an email is safe.

[Request an Email Delivery Review](https://www.sdcom.co.za/contact)

Technical references: [Authentication-Results](https://www.rfc-editor.org/rfc/rfc8601.html) and [email header format](https://www.rfc-editor.org/rfc/rfc5322.html).