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public class ExampleDestinationAtLeastOnceDeliveryReceiveActor : ReceiveActor
{
    public ExampleDestinationAtLeastOnceDeliveryReceiveActor()
    {
        Receive<Msg>(msg =>
        {
            Sender.Tell(new Confirm(msg.DeliveryId), Self);
        });
    }
}


public class ExampleAtLeastOnceDeliveryReceiveActor : AtLeastOnceDeliveryReceiveActor
{
    private readonly IActorRef _destionationActor = Context.ActorOf<ExampleDestinationAtLeastOnceDeliveryReceiveActor>();

    public ExampleAtLeastOnceDeliveryReceiveActor()
    {
        Recover<MsgSent>(msgSent => Handler(msgSent));
        Recover<MsgConfirmed>(msgConfirmed => Handler(msgConfirmed));

        Command<string>(str =>
        {
            Persist(new MsgSent(str), Handler);
        });

        Command<Confirm>(confirm =>
        {
            Persist(new MsgConfirmed(confirm.DeliveryId), Handler);
        });
    }

    private void Handler(MsgSent msgSent)
    {
        Deliver(_destionationActor.Path, l => new Msg(l, msgSent.Message));
    }

    private void Handler(MsgConfirmed msgConfirmed)
    {
        ConfirmDelivery(msgConfirmed.DeliveryId);
    }

    public override string PersistenceId { get; } = "persistence-id";
}