When a message is sent to an Actor that is terminated before receiving the message, it will be sent as a DeadLetter to the ActorSystem's EventStream
public sealed class DeadLetter : AllDeadLetters, IWrappedMessage
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DeadLetter(Object, IActorRef, IActorRef)
Initializes a new instance of the DeadLetter class.
public DeadLetter(object message, IActorRef sender, IActorRef recipient)
The original message that could not be delivered.
The actor that sent the message.
The actor that was to receive the message.
This exception is thrown when either the sender or the recipient is undefined.