How to parse email headers — trace routing and SPF

Inspect raw email headers to debug delivery, authentication and routing hops.

Email headers contain Received chains, SPF/DKIM results, Message-ID and List-Unsubscribe fields — essential when debugging why mail landed in spam or tracing phishing sources.

Tentaco Email Header Parser formats headers readably in Email Studio without uploading the full message to a third party.

Steps

Copy raw headers from Gmail (Show original), Outlook (View message source) or your client.
Open Email Header Parser in Email Studio.
Paste headers — review Received hops from bottom (origin) to top (delivery).
Check Authentication-Results for SPF, DKIM and DMARC outcomes.
Note Reply-To vs From mismatches — common phishing indicator.

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