Email Header Analyzer

Paste raw email headers to instantly analyze routing hops, sender authentication (SPF, DKIM, DMARC), spam scores, delivery time, and more. Free, privacy-first email header parser.

Paste Email Headers

Copy the full raw headers from your email client and paste below.

What Is an Email Header Analyzer?

An email header analyzer (also called an email header parser) is a free tool that reads the technical metadata attached to every email message. These headers contain a complete log of the email's journey from sender to recipient — including every server it passed through, authentication checks, timestamps, and spam evaluation scores.

How to View Raw Email Headers

Every major email client lets you access raw headers. Here's how:

Gmail

Open email → ⋮ (More) → "Show original" → copy headers section

Outlook

Open email → File → Properties → copy text in "Internet headers" box

Apple Mail

View → Message → All Headers (⌥⌘H), then copy

Thunderbird

View → Headers → All, or Ctrl+U for source

Understanding the Key Email Headers

Received: Added by every mail server that handles the email. Reading them bottom-to-top traces the full delivery path.
From / To / Subject: Familiar sender and recipient information visible in your inbox.
Message-ID: A globally unique identifier assigned to the email.
Authentication-Results: Server-generated verdict of SPF, DKIM, and DMARC checks.
X-Spam-Score: A numeric score assigned by spam filters — higher means more suspicious.
DKIM-Signature: Cryptographic proof that the email was not tampered with in transit.

SPF, DKIM, and DMARC Explained

SPF

Sender Policy Framework

Validates that the sending server's IP is authorized to send email on behalf of the domain.

DKIM

DomainKeys Identified Mail

Uses cryptographic signatures to verify that the email content was not altered in transit.

DMARC

Domain-based Message Auth.

Sits on top of SPF/DKIM. Tells receivers what to do (quarantine, reject, none) when checks fail.

Why Analyze Email Headers?

Detect phishing and spoofing — SPF/DKIM/DMARC failures are a red flag for fraudulent emails.
Debug email deliverability — Trace exactly where an email got delayed or blocked.
Investigate spam — Identify the originating IP and mail relay chain.
Verify email marketing tools — Confirm your ESP is properly authenticating your sends.