Use this report to find out which groups of mailboxes, for instance departments, generate most of the traffic.
How to detect mailboxes with a high activity level
The maximum delivery threshold will soon be set to 3,600 messages per hour in Office 365; any emails sent to a mailbox exceeding this limit will receive a non-delivery report. This post describes how to detect mailboxes whose level of activity could lead to this situation.
Sample Report: Top Departments By Number Of Sent Messages Internally
This sample report shows which departments send the most messages internally.
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