What is an email header analyzer?

It’s a tool that decodes raw email headers to show authentication results (SPF, DKIM, DMARC), routing hops, and sender IPs.

How do I analyze email headers?

Copy the full message headers from your email client and paste them into MailTested’s Email Header Analyzer to get an instant breakdown.

What can I learn from an email header?

You can trace message delivery, verify sender authenticity, detect forged emails, and analyze how spam filters processed the message.

Does this tool support SPF, DKIM, and DMARC?

Yes. It extracts and interprets SPF, DKIM, and DMARC verdicts, showing pass/fail results and overall authentication alignment.

Analyze Full Email Headers for SPF, DKIM & DMARC

Decode the entire message path, authentication results, and sender IP chain. MailTested’s free Email Header Analyzer helps identify routing issues and spoofed senders instantly.

🚀 Step 1: Paste Your Full Email Header

Explore more tools: SPF Checker • DKIM Checker • DMARC Checker • IP Blacklist Checker

Learn more: How to Read Email Headers • Understanding & Fixing SPF, DKIM & DMARC • Fix Email Delivery Failures

📘 Email Header Analyzer — Frequently Asked Questions

It displays sender, receiver, and routing information. Headers reveal each mail server that handled the message and include authentication results like SPF, DKIM, and DMARC.

MailTested highlights misaligned SPF or DKIM signatures and mismatched sending IPs, exposing spoofed or compromised senders before they reach your users.

Yes. The analyzer calculates hop counts, identifies each relay’s IP, and estimates total transit time for advanced mail flow diagnostics.

No. MailTested processes headers in-memory for analysis only. No data is stored or logged — ensuring complete privacy and GDPR compliance.

📨 Why Analyze Email Headers?

Email headers contain critical routing and authentication data that help trace message origin, detect delivery issues, and validate SPF, DKIM, and DMARC alignment. They are essential for diagnosing why messages land in spam or fail authentication checks.

MailTested’s Email Header Analyzer transforms cryptic header lines into human-readable insights — perfect for postmaster teams, deliverability experts, and IT administrators.

🧩 Why Use MailTested’s Header Analyzer

Unlike basic parsers, MailTested expands and interprets SPF, DKIM, and DMARC verdicts, identifies relay chains, and correlates DNS lookups for full transparency.

It’s optimized for fast copy-paste workflows — you get authentication results, path visualizations, and forensic spam indicators in one instant report.

📄 Common Header Lines Explained

Received: Shows every mail server involved in delivery.

Authentication-Results: Summarizes SPF, DKIM, and DMARC results.

Return-Path: The envelope sender used for SPF checks.

Message-ID: A unique identifier assigned by the sender’s mail system.

X-Spam-Status: Indicates spam filtering verdict and score.