Free Tool

Email Header Analyzer

Paste raw email headers below to trace the delivery path, check authentication results (SPF, DKIM, DMARC), detect hop delays, and identify potential issues.

How to Use

How to use the Email Header Analyzer

Get the raw headers

In your email client, find the option to view raw or original headers (e.g., 'Show original' in Gmail).

Paste headers

Copy the full raw headers and paste them into the input area. Include everything from 'Received:' to the end.

Click Analyze

The tool parses all headers instantly — no server call needed. Results appear in organized sections below.

Review results

Check authentication (SPF/DKIM/DMARC), trace the delivery path hop by hop, and review any warnings about delays or failures.

Features

Why use our Email Header Analyzer?

Authentication Check

Instantly checks SPF, DKIM, and DMARC results with color-coded pass/fail indicators.

Delivery Path Tracing

See every server hop with timestamps and delays. Identify where bottlenecks or delays occurred.

Smart Warnings

Automatically flags issues like failed authentication, long delays, clock skew, and potential spoofing indicators.

Message Summary

Extracts From, To, Subject, Date, and Message-ID into a clean summary table.

100% Browser-Based

All parsing happens client-side. Your email data never leaves your device.

Header Unfolding

Automatically handles multi-line (folded) headers per RFC 2822 for accurate parsing.

FAQ

Email Header Analyzer — Common Questions

Email headers are metadata attached to every email. They contain information about the sender, recipient, servers the email passed through, authentication results, and timestamps. They're usually hidden from view but essential for debugging deliverability issues.

In Gmail: open the email, click the three dots menu, and select 'Show original'. In Outlook: open the email, click File > Properties, and look in the 'Internet headers' box. Most email clients have a similar option.

SPF verifies the sending server is authorized by the domain. DKIM uses digital signatures to verify the email wasn't altered in transit. DMARC combines both and tells receiving servers what to do with failures. All three passing means the email is authentic.

Yes, completely free with no sign-up required. Analyze as many email headers as you need.

Yes. All analysis happens in your browser. No email data is sent to any server or stored anywhere.

Each hop represents a server the email passed through. Delays show how long each server took to process and forward the email. Long delays (over 30 minutes) may indicate greylisting, queue backlogs, or server issues.

More Tools

Related free tools

Performance