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sica-fondt/knowledge/cyber-skills/skills/performing-dmarc-policy-enforcement-rollout/references/standards.md
Claude 24f816b6a3
Consolidate 22 sibling repos into layered organism structure 
Place useful parts of the surrounding repos into sica-fondt by layer, per the
body model (Ada = membrane; brain/endocrine/capabilities/knowledge non-Ada):

- brain/        LLM reasoning + providers (dapr, hermes, MoMoA)
- capabilities/ REPRAG sidecars: hermes tools/skills, dapr tools, parallel
                dispatch, A51 channels, and the OSINT cluster
- knowledge/    LORAG corpus: 754 cyber-skills, agency personas, secure-coding,
                MITRE ATT&CK data
- reference/    defensive threat-reference (C3, shhbruh doc) + AdaYaml parser

License handling: AGPL sources (worldosint, advanced_evolution, mercury,
Reticulum) and GPL DeTTECT are SPEC-only clean-room/port descriptions — no
copyleft code copied. MIT/Apache/data parts copied as working trees.

Safety: shhbruh escape/persistence material and C3 covert-C2 kept as reference
only, not wired into the running organism. See CONSOLIDATION.md.

https://claude.ai/code/session_01UehUqEXXJJCsHoA4voCU5c
2026-06-10 06:53:01 +00:00

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Standards & References: Performing DMARC Policy Enforcement Rollout

Core Protocol Standards

  • RFC 7489: Domain-based Message Authentication, Reporting, and Conformance (DMARC)
  • RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email
  • RFC 6376: DomainKeys Identified Mail (DKIM) Signatures
  • RFC 8616: Email Authentication for Internationalized Mail
  • RFC 8601: Message Header Field for Indicating Message Authentication Status

Regulatory Requirements (2025)

  • Google Bulk Sender Requirements: DMARC required for senders of 5,000+ messages/day to Gmail
  • Yahoo Sender Requirements: DMARC authentication required for bulk senders
  • PCI DSS 4.0 Requirement 5.3: Anti-phishing mechanisms including email authentication
  • NIST SP 800-177 Rev.1: Trustworthy Email guidance

DMARC Policy Progression

Phase Duration Record pct Monitoring
Discovery 2-4 weeks p=none N/A Daily report review
Soft enforce 4-6 weeks p=quarantine 10->100 Twice-weekly review
Hard enforce 4-6 weeks p=reject 10->100 Weekly review
Maintenance Ongoing p=reject 100 Monthly review

SPF Lookup Limit

  • Maximum 10 DNS lookups per SPF evaluation (RFC 7208 Section 4.6.4)
  • Each include:, a:, mx:, redirect=, and exists: counts as one lookup
  • Exceeding 10 lookups causes SPF permerror (treated as fail by some receivers)
  • Use SPF flattening tools to stay within limit

MITRE ATT&CK References

  • T1566.001: Phishing: Spearphishing Attachment
  • T1566.002: Phishing: Spearphishing Link
  • T1586.002: Compromise Accounts: Email Accounts
  • T1656: Impersonation