checkdmarc ☆
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Description:
Command-line parser for SPF and DMARC DNS records
Type: Formula  |  Latest Version: 5.12.27@0  |  Tracked Since: Dec 17, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: email security dns spf dmarc authentication
Install: brew install checkdmarc
About:
checkdmarc is a command-line tool and Python library that validates SPF and DMARC DNS records for email domains. It performs DNS lookups to check for syntax errors, policy configurations, and potential security vulnerabilities. The tool helps administrators ensure their email authentication is correctly set up to prevent spoofing and phishing attacks.
Key Features:
  • Validates SPF and DMARC records for syntax and policy correctness
  • Checks for common misconfigurations and security issues
  • Supports both command-line usage and Python library integration
  • Performs authenticated SMTP testing to verify MX records
Use Cases:
  • Auditing email security configurations for organizational domains
  • Monitoring DNS record changes for compliance drift
  • Troubleshooting email deliverability issues
Alternatives:
  • dmarcian – Web-based service with similar functionality but requires paid subscription for advanced features
  • opendmarc – Open-source DMARC filter implementation focused on message processing rather than DNS validation
Version History
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