Routes can be matched in a variety of ways.
"All" means that all matching routes will be triggered. This can mean the email is routed for a single recipient to multiple recipients based on each route matched.
"Priority" means that the first matching route will be used routes will be checked in order of priority (low to high)
"Best" means the most appropriate match will be selected. This means more specific routes will take precedence. e.g. firstname.lastname@example.org will match even if *@domain.com is another routed recipient.