| 
  
   Menu 
  × 
      
    × 
      Correct! 
    Exercise:Where will a message go if it can't be successfully delivered? 
To a @(11) @(5)
 
To a dead-letter queue
     Not CorrectClick here to try again. Correct!Next ❯ | 
This will reset the score of ALL 49 exercises.
Are you sure you want to continue?