Email Header Analyzer
Email headers contain the full routing and authentication history of a message. An email header analyzer parses this raw data and surfaces the information that matters most for diagnosing deliverability issues: SPF/DKIM/DMARC results, server hop count, sending IP, and the From/Reply-To alignment that spam filters check.
Raw headers can span dozens of lines and use technical notation that is difficult to read without a dedicated tool. Our analyzer structures the output into a clear table, highlights authentication pass/fail status with colour-coded badges, and flags anomalies such as excessive server hops or missing required fields.
You can use our free Header Analyzer tool directly in your browser — just paste the raw headers and get instant results with no account required. For full .eml analysis including AI advice, create a free account and upload your file.
What the header analyzer extracts
- Authentication-Results: SPF, DKIM, and DMARC pass/fail
- From, To, Subject, Date, and Message-ID fields
- Received header hop count (routing path length)
- X-Mailer and sending software identification
- List-Unsubscribe header presence and format