Which setting would help to enhance email security by preventing impersonation of legitimate users?

Enhancing email security and preventing the impersonation of legitimate users can be effectively addressed through the implementation of ARMed Policies. ARMed Policies, which stand for "Advanced Risk Management," are designed to analyze the context and behavior of email messages actively. By evaluating the risk associated with sender behavior and communication patterns, these policies can help identify and block deceptive attempts to impersonate legitimate users.

Through the use of ARMed Policies, organizations can mitigate threats like phishing or business email compromise, where malicious actors try to impersonate trusted sources. This proactive approach allows for real-time monitoring and responsive actions to be taken against emails that exhibit suspicious behavior or do not align with the known characteristics of genuine communications from trusted individuals within an organization.

In contrast, the other settings do not primarily focus on preventing impersonation. While Permit Sender Policy might allow certain trusted senders, it does not assess the legitimacy based on behavior. The Blocked Sender Policy mainly functions to prevent known bad actors but does not enhance security against impersonation of legitimate users specifically. Lastly, the Spam Dependency Policy is primarily concerned with classifying unsolicited emails, which does not directly address the impersonation aspect of email security.