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DMARC Reject - The strictest of the three, this policy instructs receiving mail servers to outright reject emails failing DMARC authentication. These emails are not delivered to the recipient's inbox and are typically returned to the sender or discarded entirely.
In summary, each DMARC policy—None/Ignore, Quarantine, and Reject—offers varying levels of protection against email spoofing and phishing attacks. Organizations should assess their security needs, evaluate the potential impact on legitimate email delivery, and implement DMARC policies accordingly to enhance email security effectively.
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