performing-dmarc-policy-enforcement-rollout

# 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 - Understanding of SPF, DKIM, and DMARC protocols (RFC 7208, 6376, 7489) - Complete inventory of all legitimate email sending sources - DMARC reporting analysis tool (EasyDMARC, DMARCLY, Valimail, or dmarcian) - Email gateway with DMARC enforcement capability ## Key Concepts ### DMARC Policy Levels | Policy | Behavior | Use Case | |---|---|---| | p=none | Monitor only, no action on failures | Discovery phase | | p=quarantine | Send failing messages to spam/junk | Transition phase | | p=reject | Block failing...