title: NServiceBus send messages not appearing at endpoint
body: <p>I have a problem in NServiceBus 3.</p>
  
  <p>I'm trying to send messages to an endpoint. The message type and endpoint is configured in the config as</p>
  
  <pre><code>&lt;UnicastBusConfig&gt;
      &lt;MessageEndpointMappings&gt;
          &lt;add Messages="GatewayMessages.ProcessAttachmentCommand, GatewayMessages" Endpoint="Attachments"/&gt;
      &lt;/MessageEndpointMappings&gt;
  &lt;/UnicastBusConfig&gt;
  </code></pre>
  
  <p>The endpoint has, in its EndpointConfig.cs, the following configuration:</p>
  
  <pre><code>        Configure
              .With()
              .DefineEndpointName("Attachments")
              .DefaultBuilder()
              .DBSubcriptionStorage()
              .XmlSerializer()
              .FileShareDataBus(@"C:\Attachments\nservicebus\databus")
              .MsmqTransport()
              .UnicastBus()
              .LoadMessageHandlers()
              .CreateBus()
              .Start(() =&gt; Configure.Instance.ForInstallationOn&lt;NServiceBus.Installation.Environments.Windows&gt;().Install());
  </code></pre>
  
  <p>I also have a <code>IMutateTransportMessages</code> class configured with</p>
  
  <pre><code>        Configure.Instance.Configurer.ConfigureComponent&lt;TransportMessageCompressionMutator&gt;(DependencyLifecycle.InstancePerCall);
  </code></pre>
  
  <p>The problem I'm getting is when calling Bus.Send with the ProcessAttachmentCommand the endpoint isn't receiving anything. With the endpoint stopped I'm not even seeing any messages appearing in the endpoint queue.</p>
  
  <p>With a breakpoint in the <code>MutateOutgoing</code> method of the <code>TransportMessageCompressionMutator</code> I can see the outgoing message, so it looks like the call to <code>Bus.Send</code> is OK but it doesn't appear to be going to the endpoint.</p>
  
  <p>Is there anywhere else other than the configuration I've included that may influence the delivery of messages?
  And is there any way at the message level to see where they're being directed?</p>
  
  <p>My NServiceBus host doesn't log any errors, it's like the messages are just vanishing. It's most confusing!</p>