Hi,
As per my experience, from Exchange side, we could use the throttling policy to specifies the number of messages per minute that can be submitted, then assign it to a user.
New-ThrottlingPolicy -Name LimitMessagesSent -MessageRateLimit "<number>"
Set-Mailbox -Identity "<mailboxname>" -ThrottlingPolicy LimitMessagesSent
Then we may find a way to generate an alert from SCOM if the message number exceed the specified limit.
Hope it helps.
Regards,
Manu Meng
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