Email Header Analyzer
Paste email headers to trace the delivery path, check authentication results, and identify spam signals.
In Gmail: Open email → ⋮ Menu → "Show original". In Outlook: File → Properties → Internet headers.
How to use the Email Header Analyzer
Paste email headers to trace the delivery path, check authentication results, and identify spam signals. Enter the domain, hostname, IP address, selector, or record value requested by the tool, then run the check to see the current public configuration. Use the result to confirm whether the domain is resolving correctly, whether email authentication is aligned, or whether a visible trust issue needs follow-up.
Enter the domain or value you want to inspect.
Review the returned records, warnings, and status signals.
Fix the DNS, hosting, SSL, or email setting, then retest.
What to check next
A single lookup rarely tells the whole story. For production websites, verify DNS, SSL, email authentication, blacklist status, and public security headers together before making a launch, migration, or deliverability decision. Common next checks after this page include DMARC Checker, SPF Checker, DKIM Checker.
Email Header Analyzer FAQ
What does the Email Header Analyzer check?
Paste email headers to trace the delivery path, check authentication results, and identify spam signals.
Is the Email Header Analyzer free to use?
Yes. The basic email header analyzer is free and does not require a login. Paid Hostao reports and fix plans are available when you need analyst review or managed remediation.
When should I run the Email Header Analyzer?
Run it before DNS changes, email sender changes, hosting migration, SSL renewal, launch checks, or whenever a website, domain, or email delivery issue needs quick verification.