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ToolsDNS Security Audit
Domain & ServerFree Tool

DNS Security Audit

Analyze SPF and DMARC records to prevent email spoofing and improve deliverability. Secure your domain against phishing attacks.

DNS Security Check

What is DNS Security?

DNS Security protocols like SPF and DMARC are technical layers added to your domain's DNS settings to authorize which mail servers can send emails on your behalf. Without these records, bad actors can "spoof" your email address, potentially damaging your brand and tricking your customers.

  • Authentication: Verify the sender's true identity.
  • Prevention: Block unauthorized emails from reaching inboxes.
  • Deliverability: Improve chances of legitimate mail reaching its target.

Why Spoof Prevention Matters

Email remains the #1 vector for cybersecurity attacks. Many businesses are unaware that their domain can be used by anyone to send emails if the proper DNS records aren't in place.

"DMARC is the most powerful weapon in your arsenal against email fraud. It doesn't just authenticate—it gives you a voice in how receivers handle unauthorized mail."
Brand Protection
Prevent phishing campaigns from using your legitimate business domain.
Spam Avoidance
Domains with correct security records are less likely to be flagged as spam.

Best Practices

To fully secure your domain's email ecosystem, we recommend this multi-step approach:

  • Start with SPF: List every service that sends mail for you (e.g., Google Workspace, Zendesk, Mailchimp).
  • Move to DMARC: Start with a policy of p=none to monitor traffic, then move to p=quarantine or p=reject.
  • Implement DKIM: Use cryptographic signatures to ensure email content hasn't been tampered with.
  • Regular Audits: Periodically check your records to prune old services that no longer need sending permissions.

How to Use This Tool

Simply enter your domain name (without https://) and click "Audit". Our engine will query your DNS provider for SPF and DMARC TXT records. We'll analyze the syntax and version of each record, giving you a security grade based on how well-protected your domain is against spoofing.

Frequently Asked Questions

Sender Policy Framework (SPF) is an email authentication method that specifies the mail servers authorized to send email on behalf of your domain.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) uses SPF and DKIM to determine the authenticity of an email message.
They prevent attackers from spoofing your domain (sending fake emails from

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