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DMARC Policies

DMARC supports three enforcement policy levels, each representing a different degree of protection:

  • p=none (Monitor Mode) – No enforcement. Messages that fail DMARC are still delivered, but the domain owner receives DMARC reports to observe unauthorized activity.
  • p=quarantine (Partial Enforcement) – Suspicious messages are marked as spam or placed in the recipient’s junk folder. This helps reduce risk while still allowing legitimate but misconfigured mail to surface.
  • p=reject (Full Enforcement) – Messages that fail DMARC are completely rejected at the server level and never reach the recipient. This is the strongest protection against spoofing.

Domains typically begin with p=none, then progress to quarantine and finally to reject once all legitimate senders are properly authenticated.