No, from DeadLetterActorRef:

      override protected def specialHandle(msg: Any): Boolean = msg match {
        case w: Watch ⇒
          if (w.watchee != this && w.watcher != this)
            w.watcher ! Terminated(w.watchee)(existenceConfirmed = false, addressTerminated = false)
          true
        case w: Unwatch  ⇒ true // Just ignore
        case NullMessage ⇒ true
        case _           ⇒ false
      }