Email header analyzer

Paste full email headers to see the delivery path, per-hop delays, and authentication results.

Paste the header block from “Show original” / “View source”. Up to 200,000 characters.

Analyzed in this browser. Nothing is sent anywhere.

Reading, not verifying: spf/dkim/dmarc verdicts are quoted from the Authentication-Results header as written — a forged header can claim anything. Delays come from each server's own timestamp, so clock skew shows up as small negative or inflated gaps.

How to use

  1. Copy the full headers ("Show original").
  2. Paste them in.
  3. Read the summary and the Received hop list.

What it supports

Reads Received hops and Authentication-Results as written — up to 50 hops, 200,000 characters. It quotes the headers, it does not verify them; forged headers can lie.

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