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Free Tools

Free email security tools

Check your email authentication, investigate suspicious messages, and confirm your mail servers are secure. No signup required.

Every tool runs in your browser. Your files and headers are never uploaded.

DMARC Report Analyzer

Upload DMARC aggregate reports to see who is sending email as your domain, what passes, and what to fix.

  • XML, .gz and .zip reports
  • SPF and DKIM alignment
  • Policy readiness and PDF export
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Email Header Analyzer

Paste the headers of any email to check SPF, DKIM and DMARC results, trace its route, and spot spoofing.

  • Paste headers or open an .eml file
  • Delivery path and delays
  • Phishing and spam indicators
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TLS-RPT Report Analyzer

Upload SMTP TLS reports to see whether mail reaches your servers encrypted, and why connections fail.

  • JSON, .gz and .zip reports
  • MTA-STS and DANE results
  • Failure types with fixes
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Private by design

Reports, headers and files are processed on your device. Nothing you check is sent to or stored on our servers.

Plain-English results

Every tool explains what it found and exactly what to fix, not just a list of raw values.

Reports you can share

Export results as a PDF to share with your IT team, your email provider, or your managed service provider.

Go beyond one-off checks

MailIntel watches your DMARC reports continuously and alerts you when something needs attention.

Apply for monitoring

Which tool do I need?

Setting up or monitoring DMARC? Use the DMARC Report Analyzer to see every service sending email as your domain and whether it passes SPF, DKIM and DMARC. It's the essential step before moving to p=quarantine or p=reject.

Checking one suspicious or misdelivered message? Paste its headers into the Email Header Analyzer to see its authentication results, the servers it passed through, and any spoofing warning signs.

Using MTA-STS or DANE? The TLS-RPT Report Analyzer shows whether other mail servers can reach yours over a valid encrypted connection, and explains each failure.

New to email authentication? Start with how DMARC works, or follow our step-by-step Microsoft 365 guides.