A message can be held as a result of a Policy. Which Policy cannot apply the HOLD action?

The correct answer indicates that the Blocked Senders policy cannot apply the HOLD action to messages. The rationale behind this is rooted in the primary function of the Blocked Senders policy, which is designed to prevent specific senders from delivering emails to the intended recipients. When a sender is blocked, their messages are immediately rejected or filtered out, rather than being held for review. This approach effectively eliminates unwanted communications without giving the organization an opportunity to evaluate the content of those messages.

In contrast, other policies such as Retained Messages, Spam Filter, and Encryption Policy may involve actions where messages can be held for further analysis, review, or processing. Retained Messages are preserved for compliance and regulatory purposes, allowing organizations to retain and hold emails as necessary. Spam Filter policies may hold messages that are suspected to be spam for users to review before they are either deleted or delivered, while Encryption Policies often require messages to be reviewed and held until proper encryption measures are validated.

Thus, the nature of the Hold action aligns more with policies that facilitate review and compliance, rather than immediate rejection, which is characteristic of the Blocked Senders policy.