DMARC is designed to protect against direct domain spoofing. When an email is sent by an unauthorized sender (whether it is sent by a malicious actor, or even an unauthorized or non-participating department of the company that owns/operates the domain), DMARC can be used to detect the unauthorized activity and (if so configured) request that those messages be blocked or discarded when they are received.
What type of illegitimate email does DMARC address?
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