DMARC Parser

Parses a DMARC TXT record to present a structured view of policy, reporting, and alignment for domain administrators and security teams.

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About This Tool

The DMARC parser analyzes a DMARC TXT record and returns a structured view of the policy, reporting, and alignment settings for domain administrators and security teams.
Conceptually, the tool tokenizes the record into tag-value pairs, checks the v tag, and maps each parameter to a canonical field. It handles common variants and reports parsing issues precisely.
Output is a machine-friendly object that lists version, policy (p), subdomain policy (sp), reporting addresses (rua/ruf), alignment modes (aspf, adkim), and percentage (pct). It also flags missing values or conflicting entries to guide tuning.
The parser does not perform DNS lookups or validate domain control; it relies solely on the provided DMARC TXT text and produces a deterministic interpretation suitable for automation and audits.

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How to Use

Provide inputs: DMARC TXT record string and optional domain context.
Run parse to generate a structured output.
Review policy, reporting, and alignment fields in the result.
Identify issues and adjust the DMARC record accordingly.
Re-parse to confirm changes before publishing.

Frequently Asked Questions

Find Quick Answers

What is DMARC?

DMARC is an email authentication protocol that builds on SPF and DKIM to prevent domain spoofing and to provide reporting on message authentication results. It enables domain owners to publish a policy and receive feedback for remediation and policy tuning.

What does rua mean?

rua specifies the address(es) for aggregate reports, while ruf specifies forensic reports if requested. The parser validates mailto: URIs when present and explains how these reports summarize authentication outcomes for the domain.

What if p=none?

p=none indicates monitoring only; the parser shows the policy in effect and highlights accompanying reporting and alignment fields, allowing assessment before enforcing stricter actions on mail delivery.

Can I parse multiple records?

The tool parses a single DMARC TXT string at a time. To compare configurations, run separate parses for each record and review differences in policy, alignment, and reporting fields.

Need to run multiple calculations?

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