Network Tools

Email Header Analyzer Guide

Learn when to use Email Header Analyzer, how to use it correctly, and how to avoid common mistakes.

What this guide covers

Use this Email Header Analyzer to inspect raw email headers and extract important fields such as From, To, Subject, Date, Message-ID, Received, Return-Path, SPF, DKIM, and DMARC-related results. It is useful for troubleshooting delivery issues, understanding mail flow, and basic email analysis.

This guide explains when to use Email Header Analyzer, how to get a cleaner result, and which mistakes to avoid before moving on to related tools or the main tool page.

Why use Email Header Analyzer

Quickly extracts important fields from raw email headers.
Useful for mail troubleshooting and delivery analysis.
Helps review SPF, DKIM, and authentication-related lines.
Good for understanding Received chains and routing.
Works locally in the browser without external lookup.

How to use Email Header Analyzer

Paste the raw email headers into the input box.
Run the tool to parse the header lines.
Review the extracted summary and key fields.
Use the result to inspect routing and authentication data.

Best use cases

Reviewing mail routing from Received headers.
Checking SPF, DKIM, and DMARC outcomes.
Troubleshooting email delivery issues.
Inspecting raw headers during support or admin work.

Common mistakes

The full email body is pasted instead of headers only.

Fix: Paste the raw header block for the clearest output.

Headers are incomplete or truncated.

Fix: Copy the full original raw headers from the email client.

Users expect live DNS or reputation checks.

Fix: This tool parses header content only and does not perform external reputation lookups.

Use the tool

Ready to run Email Header Analyzer? Open the main tool page to enter your input, generate the result, and copy or download the output.

Open Email Header Analyzer