Invalid Email Task
An Invalid Email task locates those contacts whose emails have not been sent successfully because of a hard-bounce or soft-bounce situation.
When you create your new task, you will give it a name that displays for the task in the Task List and the group name in the To Do List. You may want to include the condition (Hard or Soft bounce) in the name to distinguish the results. You can set the task to run on a daily or weekly basis.