Email header analyzer

Unfold fields and inspect the recorded route.

On your device · No account

Privacy details

Email header analyzer processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Your input

Options and local file

Open a text file on this device

Optional settings apply only to this tab.

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-20

Email header analyzer explained

Unfold an email’s header fields, preserve repeated fields and show Received hops in their recorded newest-first order. Authentication-Results fields are shown as claims for inspection, without presenting them as established security results.

Next: DMARC report analyzer

A worked example

A Subject line followed by an indented continuation becomes one field value. Two Received fields remain two separate hops in their original order.

Before you use the result

This does not query DNS, verify DKIM, establish SPF alignment or prove who sent a message. Header timestamps and hostnames may be forged. Message bodies after the first blank line are not parsed.

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ToolOctopus. “Email header analyzer.” Updated 2026-09-20. https://tooloctopus.com/email-header-analyzer.

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