Individual skill

performing-dmarc-policy-enforcement-rollout

Execute a phased DMARC rollout by inventorying sending sources, configuring SPF/DKIM alignment, and progressing DNS policy from p=none monitoring through p=quarantine to p=reject enforcement, ensuring all legitimate email sources authenticate before unauthorized senders are blocked. Use when deploying or advancing an organization's DMARC anti-spoofing posture, or when meeting bulk-sender authentication requirements from Google and Yahoo.

skills/performing-dmarc-policy-enforcement-rollout/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 35,841
Repository last updated: Aug 31, 2026
License: Apache-2.0

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ai-agents Repository topic
claude-code Repository topic
cybersecurity Repository topic
incident-response Repository topic
mitre-attack Repository topic
penetration-testing Repository topic
red-team Repository topic
security Repository topic
cloud-security Repository topic
malware-analysis Repository topic
dmarc Declared skill tag
spf Declared skill tag
dkim Declared skill tag
email-authentication Declared skill tag
anti-spoofing Declared skill tag
phishing Declared skill tag
dns Declared skill tag
email-security Declared skill tag
security Derived category

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LICENSEasset · 11,255 bytes
SKILL.mdcore · 6,239 bytes
assets/template.mddoc · 1,577 bytes
references/api-reference.mddoc · 907 bytes
references/standards.mddoc · 1,708 bytes
references/workflows.mddoc · 2,772 bytes
scripts/agent.pyruns · 5,543 bytes
scripts/process.pyruns · 12,014 bytes

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# Performing DMARC Policy Enforcement Rollout

## Overview
Domain-based Message Authentication, Reporting and Conformance (DMARC) is the cornerstone of email anti-spoofing protection. A DMARC rollout progresses through three phases: monitoring (p=none), quarantine (p=quarantine), and full enforcement (p=reject). When configured at p=reject, any email that fails both SPF and DKIM checks is outright rejected. Google and Yahoo now require DMARC for bulk senders (5,000+ emails), driving a 65% reduction in unauthenticated messages. The rollout typically takes 3-6 months for safe deployment.


## When to Use

- When conducting security assessments that involve performing dmarc policy enforcement rollout
- When following incident response procedures for related security events
- When performing scheduled security testing or auditing activities
- When validating security controls through hands-on testing

## Prerequisites
- Administrative access to DNS management for the domain