However, this has been
changed to 500MB in Exchange Server 2007 SP1. The configuration options for back pressure can be
modified in the EdgeTransport.exe.config application configuration file.
Figure 7-6
Part II: Working with Server Roles
200
Figure 7-7
Priority Queuing
Priority queuing is new to Exchange Server 2007 SP1 and allows Hub Transport servers to process
messages based on the priority defined by the sender (Low, Normal, High). As discussed earlier in this
chapter, after a message is categorized, it is placed in a delivery queue, either local (MAPI) or remote
delivery. With the Priority Queuing feature enabled, all messages placed in a specific delivery queue are
processed to their destination based on the message priority stored in the X - Priority header field. As
with the back pressure feature, the configuration options priority queuing can be modified in the
EdgeTransport.exe.config application configuration file. However, the settings configured override
the limits set by the Set-TransportServer cmdlet (discussed in the following section). Figure 7 - 8
shows timeout values configured on the Hub server.
Figure 7-8
Chapter 7: Confi guring the Hub Transport Role
201
Figure 7-9
Transport Server Limits
Several limits that apply to message and connection retry attempts, message expiration, connection
limits, and restrictions can be set on the Hub server.
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