Microsoft Exchange Server 2010 Hub Transport and Edge Transport server role uses Back Pressure feature for system resource monitoring. Back Pressure monitors system resources like hard disk space and memory. If system resource utilization exceeds the specified limit, the Exchange server stops receiving new messages.
In Exchange Server 2007, when a Hub Transport or Edge Transport server resources are highly used, any new incoming connections are rejected. This has been changed in Exchange Server 2010 where incoming connections are accepted, but incoming messages are accepted at slower rate or are rejected.
There are three back pressure levels:-
· Normal means resource not overused. The server accepts new connections and messages.
· Medium means resource slightly overused. Back pressure is applied to the server in a limited manner. Mail from senders in the authoritative domain can flow. However, the server rejects new connections and messages from other sources.
· High means resource highly overused. Full back pressure is applied. All message flow stops, and the server rejects all new connections and messages.
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