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Why DMARC aggregate reports matter before tightening email policy

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DMARC aggregate reports are compressed XML summaries of observed mail flows, showing authentication results, alignment, and dispositions, rather than a simple compliance checkbox. Moving to enforcement without reviewing them can block legitimate mail or overlook senders that never authenticated. The reports are evidence with limited scope and delay, and they do not reveal intent behind a sending source. Teams should map each source to an owner and sending path, check subdomain policies separately, and protect the reports since they can expose partner and delivery details. A gradual rollout, with controlled enforcement and monitoring, is recommended before full enforcement.

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