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Exchange Server 2010 : Implementing Client Access and Hub Transport Servers - Transport Pipeline

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The transport pipeline reflects the internal routing of messages within the Hub Transport server. The elements of this are shown in Figure 17.10. These consist of the following:
Figure 1. Transport pipeline.

The figure also illustrates the relationships that the Hub Transport server role has with the other Exchange Server 2010 roles.

Messages get into the transport pipeline onto a Hub Transport server through one of four ways, as shown in Figure 17.10:

  • Through the SMTP Receive Connector

  • Through files being placed in the pickup or replay directories

  • Through the submission queue by the mailbox store driver

  • Through submission from an agent (not shown)

After the messages have gotten into the pipeline, they flow through the pipeline. The various segments of that pipeline are discussed in the following sections.

SMTP Receive Connector

In the Hub Transport server, the SMTP Receive Connector accepts SMTP (port 25) messages. Basic server-level policies are applied, such as the authorization of the remote IP address of the server and authentication of the server.

If installed on the Hub Transport server, the messages coming into the SMTP Receive Connector are also processed by antivirus and antispam services.

If they pass the SMTP Receive Connector, the messages flow down the transport pipeline to the submission queue.

Submission Queue

The submission queue takes messages from the SMTP Receive Connector, as well as from the mailbox store driver, the pickup and replay directories, and from agents such as the transport rules agent.

When messages enter the submission queue, the OnSubmittedMessage event activates. This triggers the journaling agent.

The messages are held in the submission queue until they are pulled out one at a time (first in, first out) by the categorizer.

Categorizer

The categorizer processes each message that it retrieves from the submission queue. The categorizer does four main steps:

  • Resolving recipient addressing

  • Determining routes to recipients

  • Converting message content

  • Rules processing

The last step, rule processing, is where the agents that trigger on the OnRoutedMessage event activate. On the Hub Transport server, that is all the default agents, including the rules transport agent, the journaling agent, and the AD RMS Prelicensing agent.

Mailbox Delivery Queue

The mailbox delivery queue handles messages that are destined for local delivery—that is, messages for recipients in mailbox servers in the same site as the Hub Transport server.

These messages are pulled off the queue one by one and delivered to the user’s mailbox by the store driver.

Remote Delivery Queue

The remote delivery queue handles messages to be routed to other Hub Transport servers within the forest for messages destined for other mailbox servers within the organization but in a different AD site. The remote delivery queue also handles messages destined for external mail systems in other forests and for the Edge Transport servers.

Messages in the remote delivery queue are sent out via the SMTP Send Connector.

Other  
  •  Exchange Server 2010 : Implementing Client Access and Hub Transport Servers - Understanding the Hub Transport Server
  •  Implementing Client Access and Hub Transport Servers : Installing the Client Access Server
  •  Implementing Client Access and Hub Transport Servers : Understanding the Client Access Server (part 2)
  •  Implementing Client Access and Hub Transport Servers : Understanding the Client Access Server (part 1)
  •  SharePoint 2010 : Implementing and Managing In Place Records
  •  Understanding Exchange Policy Enforcement Security : Creating Messaging Records Management Policies
  •  Understanding Exchange Policy Enforcement Security : Implementing Transport Agent Policies on the Edge
  •  Safeguarding Confidential Data in SharePoint 2010 : Using Active Directory Rights Management Services (AD RMS) for SharePoint Document Libraries
  •  Safeguarding Confidential Data in SharePoint 2010 : Enabling TDE for SharePoint Content Databases
  •  Safeguarding Confidential Data in SharePoint 2010 : Using SQL Transparent Data Encryption (TDE)
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