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  • "v=DMARC1; p=quarantine; pct=10"
    1 in 10 emails that fail DMARC authentication should be quarantined. The rest will be treated as having a "p=none" policy.
  • "v=DMARC1; p=quarantine; pct=50"
    1 in 2 emails that fail DMARC authentication should be quarantined. The rest will be treated as having a "p=none" policy.
  • "v=DMARC1; p=quarantine; pct=100"
    All emails that fail DMARC authentication should be quarantined.
    At this stage, you can now switch to the "p=reject" policy, and reduce or completely eliminate the "pct=100" value, or set it to a lower value (highly recommended).

The purpose of setting a percentage with the "p=quarantine" flag is to gradually implement DMARC enforcement, allowing organizations to monitor the impact of their DMARC policy before fully enforcing it. It can be helpful in scenarios where strict enforcement might risk legitimate emails being rejected erroneously. It provides a balance between security and ensuring legitimate emails are not erroneously quarantined.

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  • "v=DMARC1; p=reject; pct=10"
    1 in 10 emails that fail DMARC authentication should be rejected at SMTP time. The rest will be processed by the recipient's mail server settings.
  • "v=DMARC1; p=reject; pct=50"
    1 in 2 emails that fail DMARC authentication should be rejected at SMTP time. The rest will be processed by the recipient's mail server settings.
  • "v=DMARC1; p=reject; pct=100"
    All emails that fail DMARC authentication should be rejected at SMTP time. At  
    At this stage, you can remove the "pct=100" tag entirely.

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