Can a Permitted Sender Policy override a Block Senders Policy?

The answer is correct because a Permitted Sender Policy can indeed override a Block Senders Policy, particularly when the Permitted Sender Policy has a higher specificity. Specificity in this context refers to how narrowly defined the policy is. Higher specificity means that the policy applies to a more precise set of senders compared to a broader Block Senders Policy.

For example, if the Block Senders Policy applies to a whole domain, whereas the Permitted Sender Policy is crafted for a specific user within that domain, the latter will take precedence due to its higher specificity. The system prioritizes more specific rules over general ones to allow for exceptions in email filtering.

In contrast, policies with the same specificity will follow a hierarchy or priority rule established within the filtering system. If they're created in a certain order, typically the later one might apply. However, the key point here is that higher specificity generally determines which policy will govern the email traffic when both are applicable.