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Event ID: 15006 Source: MSExchangeTransport

Level
Description
The Microsoft Exchange Transport service is rejecting messages because available disk space is below the configured threshold. Administrative action may be required to free disk space for the service to continue operations.
Comments
 
Back pressure is a system resource monitoring feature of the Microsoft Exchange Transport service that exists on computers that are running Microsoft Exchange Server 2007 that have the Hub Transport server role or Edge Transport server role installed. Important system resources such as available hard disk drive space and available memory are monitored. If utilization of a system resource exceeds the specified limit the Exchange server stops accepting new connections and messages. This prevents the system resources from being completely overwhelmed and enables the Exchange server to deliver the existing messages. When utilization of the system resource returns to a normal level the Exchange server accepts new connections and messages.

See TB201658 and TB936715.

I basically ran out of space on my Exchange Service and ended up moving 9 GB to the secondary drive and then it worked fine.

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