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DMARC Record Analyzer

Deeply inspect and parse the syntax of a DMARC record to uncover logic flaws or unsupported tags.

FOCUS: Syntax validation
TAGS: v, p, rua, ruf, sp, adkim, aspf, pct
TARGET: _dmarc.domain.com

What is DMARC Record Analyzer?

This tool breaks down a messy, complex DMARC TXT string into human-readable elements. It verifies that every semicolon, tag, and URI is formatted exactly as the RFC demands.

How it Works

It queries the `_dmarc` subdomain, extracts the TXT record starting with `v=DMARC1`, and runs strict Regex validations against the reporting URIs, percentage applications, and policy inheritance rules.

Key Use Cases

Validating a newly created DMARC record before pushing it to production DNS.

Diagnosing syntax errors that cause receiving servers to completely ignore the DMARC policy.

Understanding complex records configured by third-party security vendors.

Advanced Details

A common mistake is forgetting the `mailto:` prefix in the `rua` or `ruf` tags, which renders reporting completely broken as mail servers cannot parse the destination.

Cybersecurity Pros & Cons

Security Advantages
  • Catches syntax errors that silently invalidate DMARC policies, leaving a domain fully exposed to spoofing.
  • Validates reporting URIs (rua/ruf) to ensure threat intelligence data is actually being collected.
  • Identifies overly permissive pct= values (less than 100) that leave a percentage of spoofed emails unfiltered.
  • Confirms subdomain policy (sp=) is set, protecting parked and unused subdomains from spoofing abuse.
Security Limitations
  • Syntax validity does not equal security effectiveness — a syntactically correct p=none record offers zero protection.
  • Analyzer results are only as current as the DNS cache — recently changed records may not reflect immediately.
  • Analysis cannot detect if rua reporting addresses are actively monitored or are abandoned inboxes.
  • Public DMARC analysis tools reveal your policy configuration to potential attackers scoping your defences.
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