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What is DMARC policy?

The p= tag in a DMARC record defines the DMARC policy, which comes in three modes:

  • 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.

Email servers use this policy to determine how to handle emails that fail authentication.