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DMARC Defender

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Check your domain for email security records like DMARC, SPF, DKIM.

webMay 15, 2026
SecurityEmail Management
What It Does

Details

DMARC Defender is a tool that queries public DNS servers to check domains for various email authentication and security protocols such as DMARC, SPF, DKIM, BIMI, TLS-RPT, and MTA-STS. It evaluates the syntax, coverage, and policy quality of these records.

Who It's For

Best fit users

  • Email administrators
  • Website owners
Why It Matters

Why this one made the cut

Ensuring proper configuration of email security records helps protect against phishing attacks and improves deliverability by validating sender authenticity.

Differentiator

What makes it different

DMARC Defender offers a comprehensive analysis including actionable insights on how to improve domain security settings.

Sources

Where we found it

Sources

GLOBAL · Hacker NewsENMay 15, 2026Visit

First discovered May 15, 2026 · Hacker News