Akka Actor Reply Messages
You can reply to a message by using sender() method. This method gives you ActorRef which is a instance of sender Actor. You can also store this reference. Replying to a message is simple, you just need to use sender() ! ReplyMsg.
If there is no sender i.e. a message which is sent without an actor or future context, the default sender is a 'dead-letter' actor reference.
Akka Actor Replying Message Example
Message recieved from deadLetters massage: Hello Message recieved from RootActor massage: Hello Child Replying to RootActor Message recieved from ActorChild massage: I got you message