Sometimes, the domain owner may want to apply the DMARC policy only to some of the emails, not all of them. They can use the “pct” tag to specify what percentage of the emails should follow the DMARC policy. The mail receiver has to respect this choice and not apply the DMARC policy to more emails than the domain owner wants. However, the mail receiver still has to report all the relevant information about the emails, regardless of the “pct” tag.

If the email is supposed to follow the DMARC policy of “quarantine”, the mail receiver should put the email in a separate folder or mark it as suspicious. If the email is not supposed to follow the “quarantine” policy (because of the “pct” tag), the mail receiver should treat the email as normal.

If the email is supposed to follow the DMARC policy of “reject”, the mail receiver should not accept the email at all (see Section 10.3). If the email is not supposed to follow the “reject” policy (because of the “pct” tag), the mail receiver should treat the email as if the “quarantine” policy applies. This way, the domain owner can try different policies without changing their current policy.

The mail receiver uses some mathematical methods to decide which emails should follow the DMARC policy and which should not, based on the “pct” tag. The mail receiver tries to make this decision as close as possible to the percentage that the domain owner wants, and to make it fair for all the emails over a period of time.

Store Results of DMARC Processing

The mail receiver should keep the results of the DMARC check for each email. Later, the mail receiver should send a summary of these results to the domain owner who uses DMARC. The summary should include information such as how many emails passed or failed the DMARC check, and why.

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