08:35:49,63 PM [testsystem-akka.actor.default-dispatcher-7] [INFO] RepointableActorRef - akkaDeadLetter Message [java.lang.String] from Actor[akka://testsystem/system/testActor-30#-2095183141] to Actor[akka://testsystem/user/pingpongactor#-1397343298] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#-1397343298] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.