Email Header Analyzer - Free Online SEO Tool & Checker

The Email Header Analyzer is a free diagnostic tool that lets you paste raw email headers and instantly trace the complete delivery path a message traveled through, from the original sending server to your inbox. It's built for webmasters, IT administrators, and marketers who need to verify email authenticity, troubleshoot deliverability issues, or confirm whether a suspicious message is spoofed. By parsing the header block, the tool exposes hidden technical details that are normally invisible in your everyday email client.

Key Features & How to Use

• Paste the full raw header text into the Paste Email Headers box and run the analysis instantly.
• View the SPF Result, DKIM Signature, and combined Auth Results to confirm the sender is authorized to use that domain.
• Check the calculated Spam Score to see how likely the message is to be flagged by filters.
• Review the Delivery Hops to map every mail server the message passed through before reaching you.
• Need help getting headers? In Gmail, open the email, click More (⋮), then Show original; in Outlook, go to File → Properties.

Best Practices

Always copy the entire header block, not just a snippet, since missing lines can produce a "Not found" result for SPF, DKIM, or DMARC checks. When investigating phishing attempts, pay close attention to mismatches between the "From" domain and the domain shown in the Delivery Hops, as this is a common spoofing red flag. Regularly auditing your own outgoing headers helps confirm your SPF, DKIM, and DMARC records are configured correctly, which directly improves inbox placement and sender reputation.

Whether you're chasing down a deliverability problem, investigating a phishing report, or simply curious how an email traveled across the internet, the Email Header Analyzer gives you a fast, accurate, and free way to decode the technical story behind every message.