When an incoming message is processed for an Account, ThinkAutomation checks each Trigger in turn, to see if it matches the Trigger conditions. The first Trigger that matches is then processed.
By default, Triggers are checked in the order they were created.
You can change the order that Triggers are checked. To do this, select Sort from the Trigger shortcut (right-click) menu:
Here you can change the order in which triggers are checked for incoming messages. Put your 'catch all' Trigger at the end of the list - so that any messages that are not matched will be processed.