Back pressure
The Exchange transport engine is designed to process extremely large volumes of messages, but circumstances can arise where a server might not have the physical capability to handle incoming or outgoing messages. For instance, a hub transport server might come under load from another source that consumes much of the available memory, or the disk space on some drives might come close to being exhausted. In these circumstances, the back pressure feature allows the transport service to continue running normally and process queued messages while it temporarily rejects incoming connections to stop new messages from being queued. In this scenario, the sending SMTP servers have to queue the messages until the situation that caused pressure ...
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