I am creating a simple Publisher/Subscriber using MassTransit and RabbitMQ.
The Publisher has the following code to initialize the bus:

```
/** create the bus */
var bus = Bus.Factory.CreateUsingRabbitMq(cfg =>
{
    var host = cfg.Host(new Uri("rabbitmq://localhost/"), h =>
    {
        h.Username("guest");
        h.Password("guest");
    });
});

/** start the bus and publish */
bus.Start();
bus.Publish<IPersonLogin>(new {FirstName = "John", LastName = "Smith"});

```

And the Subscriber has this code for initialization:

```
var bus = Bus.Factory.CreateUsingRabbitMq(cfg =>
{
    var host = cfg.Host(new Uri("rabbitmq://localhost/"), h =>
    {
        h.Username("guest");
        h.Password("guest");
    });

    cfg.ReceiveEndpoint(host, "person_login", e =>
    {
        e.Consumer<PersonLoginConsumer>();
    });
});

```

If I shut-down the Subscriber and publish 2 messages, the messages are not lost and as soon as the Subscriber comes back to life the Messages are processed.

So my questions are:

1. How do I ensure that a Message stays in the Queue of RabbitMQ until one Subscriber comes up and pick it up?
2. What happen if the Server is reboot and some Messages were not processed by any Subscriber, do they get lost or do they get processed as soon as the Subscriber come alive after reboot?
3. Is this the correct pattern to ensure that every single message is processed or should I use a different strategy?