Permissions work according to a tree structure: a parent permission affects the underlying permissions. For example, a general opt-in or opt-out automatically applies to all underlying permissions. Unless an underlying permission has been modified more recently, then it takes priority
Under the contacts module, navigate to the Permissions tab.
Next, go to theCalculated permissionstab.
Click the arrow next to the drop-down list to select the desired channel (e.g., email).