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Is a Domain-based Message Authentication, Reporting, and Conformance (DMARC) record on a parent domain inherited by its sub-domains?

Yes, the default behavior for a domain's Domain-based Message Authentication, Reporting, and Conformance (DMARC) record is inherited by any of its sub-domains that do not have their own explicit DMARC record.

An explicit DMARC record for a sub-domain overrides any policy values inherited from the parent domain.

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