You can then review the transport logs for clues. If it wasn't message delivery it may have been some mobile device activity that caused it. In this case you can use ...
But every time CPU utilization goes 100% and mail flow gets step.
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Typically, mails which fail to deliver due to duplicate mail entries etc will fall into this.
The default high level of hard drive utilization is calculated by using the following formula:
They might see it for the first time in a non-delivery report, an SMTP error
Mail server due high CPU Usage 100% and Physical Memory 98%.
delays and high CPU utilization on their Exchange server, specifically with store.exe and RPC client access.
microsoft exchange transport delivery high cpu · microsoft exchange mailbox transport delivery ...
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