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Email Header Analyzer

Read a message header: route, delays and auth results.

Email Validator Tools Reviews Free · no sign-up

Quick Tool Overview

The Email Header Analyzer lays out raw message headers: the Received chain reversed into travel order with the delay at each hop, the SPF, DKIM and DMARC verdicts, and every other header listed.

What it does
Reads raw email headers into a route and an auth summary
You give it
The raw headers, from Show original or Message Source
You get back
Hop-by-hop route with delays, plus auth results
Privacy
Headers stay in your browser — they reveal a lot
Best for
Diagnosing slow mail, spam filtering or a spoofed sender
Email Validator Tools Free, unlimited use No sign-up Runs in your browser

About the Email Header Analyzer

Raw headers are where the answer is when a message was slow, went to spam, or was not from who it said it was — and they are unreadable until something lays them out.

Paste them and the Received chain is reversed into the order the message actually travelled, hop by hop, with the server at each end and the delay between them, so a message that sat somewhere for four minutes shows exactly where.

The Authentication-Results header is read out separately: SPF, DKIM and DMARC each with their verdict, which is the first thing to check when mail is being filtered. Every other header is listed as well, with the ones that matter — From, Return-Path, Reply-To, Message-ID, List-Unsubscribe — pulled out first.

Headers can contain a great deal about who you correspond with, which is a good reason to read them in a tool that cannot send them anywhere. This one runs entirely in your browser.

Key features of the Email Header Analyzer

Route in travel order

Received headers reversed, so it reads the way the mail went.

Delay at each hop

Find the server that sat on the message for four minutes.

Auth results separated

SPF, DKIM and DMARC verdicts pulled out on their own.

Folded lines joined

Continuation lines are unfolded before parsing, as the RFC requires.

Never uploaded

Headers say who you correspond with, and stay in the tab.

How to use the Email Header Analyzer

  1. 1

    Copy the raw headers

    In Gmail: the three-dot menu, then Show original.

  2. 2

    Paste them in

    The whole block — folded lines are joined for you.

  3. 3

    Follow the route

    Each hop in travel order, with the delay at each one.

  4. 4

    Check the auth results

    SPF, DKIM and DMARC verdicts, read out separately.

Frequently asked questions

In Gmail, open the message, click the three-dot menu and choose Show original. In Outlook, File then Properties, and read the internet headers box. In Apple Mail, View, Message, then Raw Source.

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