To change a rule priority of an application:
Select Options
Select Application
Highlight the application
Click Edit
On the drop down list, select Modify rules...
Highlight the rule to modify
Click on Move up to increase the rule's priority or Move down to lower it.
Click OK.
Outpost Firewall uses the first instance of a rule having several criteria that match the application's activity and ignores all subsequent ones. The rules in the firewall rules list are processed in the order in which they are listed. Once a rule is matched, searching of the rules list stops. In other words, any other rules that match this type of communication are ignored, if they are further on the list than the first rule that matches.