These components as well as other processes and
queues constitute the transport pipeline in Exchange Server 2007. Think of it as a series of processes that
make message delivery or relay possible. Every message sent or received must go through the transport
pipeline. The transport pipeline consists of the following:
??‘ SMTP Receive: This component accepts connections on port 25 inbound to the Hub Transport
or Edge Transport servers. This component is controlled by the SMTP Receive Connector, which
is similar to the SMTP virtual server in Exchange Server 2000/2003. It is at this stage of the
transport pipeline that anti - virus and anti - spam agents are implemented to filter incoming connections,
message content, determine the sender, and apply any compliance or transport rules
configured. Actual message hygiene or transport rules performed vary slightly depending on
which server role is installed, either the Hub Transport role or Edge Transport role. A series of
events are triggered as the message is received and agents are executed against the message.
Chapter 7: Confi guring the Hub Transport Role
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??‘ Submission Queue: After a message is accepted into the organization either from SMTP Receive
or Pickup/Replay directory, it is placed into the Submission queue by the Submission process.
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