Can a Permitted Sender Policy override a Blocked Senders Policy?

A Permitted Sender Policy can indeed override a Blocked Senders Policy if it possesses a higher specificity. This means that if the conditions outlined in the Permitted Sender Policy are more detailed or defined for a particular sender, domain, or address compared to the broader scope of the Blocked Senders Policy, then the actions dictated by the Permitted Sender Policy will take precedence.

This concept is rooted in the principle of specificity within email filtering systems, where more finely-tuned rules trump broader, less specific ones. For example, if a Blocked Senders Policy is in place to block emails from a domain, but a Permitted Sender Policy specifically allows emails from a certain address within that domain, the system will allow those messages through based on the more specific rule.

In contrast, a Permitted Sender Policy does not override a Blocked Senders Policy when it lacks that level of specificity, nor does it hinge on user notification or emergency situations; such stipulations do not factor into the rule precedence that defines how email policies operate.