implementing-email-security-with-dmarc-dkim-spf

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name: implementing-email-security-with-dmarc-dkim-spf description: >- Audit and validate email authentication configurations by checking SPF, DKIM, and DMARC DNS records for a domain. Uses dnspython to query TXT records, validates SPF syntax and lookup counts, verifies DKIM selector records, parses DMARC policies, and identifies misconfigurations that enable email spoofing. Generates remediation recommendations. domain: cybersecurity subdomain: security-operations tags: [implementing, email, security, with] version: "1.0" author: mahipal license: Apache-2.0

Instructions

1. Install dependencies: pip install dnspython checkdmarc
2. Provide target domain(s) to audit.
3. Run the agent to check email security:
   • Query and validate SPF records (syntax, mechanism count, includes, redirect)
   • Check DKIM records for common selectors (google, default, selector1, selector2)
   • Parse DMARC records (policy, subdomain policy, reporting URIs, alignment)
   • Identify misconfigurations enabling spoofing
   • Generate remediation recommendations

python scripts/agent.py --domain example.com --output email_security_report.json

Examples

Email Security Audit Result

Domain: example.com
SPF: v=spf1 include:_spf.google.com ~all (WARN: softfail allows spoofing)
DKIM: selector1 OK, selector2 OK
DMARC: v=DMARC1; p=none; rua=mailto:dmarc@example.com (WARN: policy=none, no enforcement)
Risk: HIGH - p=none with ~all allows email spoofing