The "None" or "Ignore" policy within DMARC serves as a passive monitoring tool rather than an active enforcement mechanism. With this policy, domain owners can, with the appropriate settings, gain visibility into email traffic without affecting message delivery. Emails failing DMARC authentication aren't necessarily acted upon by recipient email servers; instead, domain owners can receive aggregate reports detailing authentication results. This policy is ideal for organizations in the initial stages of DMARC implementation, allowing them to understand their email ecosystem before transitioning to more stringent policies like "p=quarantine" or "p=reject".
By monitoring authentication results, domain owners can gradually refine their DMARC policy and address any issues before moving to more strict policies.