The Transport Services Layer
The Transport service performs email routing within the organization, and between the Front End transport service and the Mailbox Transport service. Using the tests mapped to this layer, administrators can proactively detect latencies in the operations of this service, analyze the impact of these latencies on transport components such as transport queues, and isolate the probable cause for these latencies – could it be owing to slowness experienced by the receive/send SMTP connectors? Could it be because of ineffective transport rules? Or could it be due to inefficient transport agents?
Figure 11 : The tests mapped to the Transport Services layer