![]() ![]() ![]() To provide more consistent message throughput and predictable message delivery latency, Exchange 2013 establishes an accumulated cost for messages. When the utilization of the monitored system resources returns to normal levels, the server slowly increases the rate at which it accepts new connections and then establishes a normal level. When a monitored system resource, such as hard disk utilization or memory utilization, exceeds the specified threshold, the server reduces the rate at which it accepts new connections and messages, and focuses on delivering existing messages. Back pressure is a system resource monitoring feature in the Transport service on Mailbox servers and on Edge Transport servers. For more information about message size limits, see Message size limits.Īnother feature that helps avoid overwhelming the system resources of an Exchange transport server is back pressure. In addition to message throttling, you can also put size limits on the individual components of messages, such as the number of recipients, the size of the message header, or the size of individual attachments. Although a large backlog of messages and connections may be waiting to be processed, the message throttling limits enable the Exchange server to process the messages and connections in an orderly manner. ![]() These limits work together to protect an Exchange server from being overwhelmed by accepting and delivering messages. Message throttling involves a variety of limits on message processing rates, SMTP connection rates, and SMTP session time-out values. These limits prevent the accidental or intentional exhaustion of system resources on the Exchange server. Message throttling refers to a group of limits that are set on the number of messages and connections that can be processed by a Microsoft Exchange Server 2013 computer. ![]()
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