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DMARC vulnerability refers to common errors that users make while implementing the protocol or enforcing it. Vulnerabilities in your email authentication system can range from simple errors like wrong syntax to more complex errors. If not fixed, these vulnerabilities may cause problems in message deliverability and provide little to no protection against domain spoofing or phishing attacks. Using DMARC monitoring tools can help validate your DNS records from time to time to resolve DMARC vulnerabilities in real-time.