DMARC, Domain-based Message Authentication, Reporting and Conformance, is a policy that tells recipients what to do with emails that fail SPF or DKIM. The policy can quarantine emails, reject them, or let them pass, while the sender receives reports. DMARC protects the domain against spoofing and increases trust with mail providers.
A DMARC policy set to reject prevents fraudsters from sending fake emails from the company's domain.
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