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By classifying and encrypting customer Personally Identifiable Information (PHI), you are specifically guarding against the risk of Sensitive Data Exposure. This OWASP security risk involves the accidental or unlawful exposure of protected data to unauthorized individuals. Encryption serves as a critical defense mechanism by ensuring that, even if data is accessed without authorization, it remains unintelligible and useless to the attacker without the decryption keys. Data classification further supports this by identifying which data is sensitive and requires such protections, ensuring that appropriate security controls are applied to prevent exposure.

The GPG18 and Forensic readiness planning (SPF) principles outline various guidelines to enhance an organization's readiness for forensic investigation and response. Principle 5, which suggests that organizations should adopt a scenario-based Forensic Readiness Planning approach that learns from experience gained within the business, emphasizes the importance of being prepared for a wide range of potential incidents by leveraging lessons learned from past experiences. This approach helps in continuously improving forensic readiness and response capabilities by adapting to the evolving threat landscape and organizational changes.

While technical solutions like antivirus updates, disabling HTML in emails, and web proxy filtering play significant roles in securing email systems, the best method to prevent email incidents is often considered to be end-user training. This is because many email threats, such as phishing, rely on exploiting user behavior rather than technical vulnerabilities. By educating users on the risks associated with suspicious emails, how to recognize potentially harmful messages, and the importance of not clicking on unknown links or attachments, organizations can significantly reduce the risk of email-related incidents. End-user training empowers individuals to act as a critical line of defense against email-based threats, complementing technical safeguards.