Deliverability

Email Header Decoder

Debug email deliverability issues with AI-powered header analysis. Decode routing, authentication, and spam indicators.

How to use

  1. Copy the full email headers from your email client
  2. Paste headers into the analyzer
  3. Click 'Analyze Headers'
  4. Review the decoded routing, authentication, and spam indicators

Frequently asked questions

How do I get email headers?

In Gmail: Open email → Three dots → 'Show original'. In Outlook: Open email → File → Properties → Internet headers. Each client has a similar 'View source' option.

What is the Received chain?

The Received headers show the path your email took from sender to recipient. Each mail server adds a Received line, creating a chain that helps diagnose delivery issues.

What does X-Spam-Status mean?

X-Spam-Status shows the spam filter's verdict and score. It lists the tests that were triggered and their individual scores that contributed to the final decision.