Detailed Message Volume by Domain Reports
On the Volume by domain tab, in the Domain column, click the domain for which you want to view the Mailbox messaged or the Daily message volume reports.
Select one of the following:
Any mailboxes for which you have received messages from the specified domain
Any volume of messages that have been sent each day from the specified domain
The detailed Volume by domain report includes the following:
Under Mailboxes messaged, the first or top 5 mailboxes that have received messages from the selected domain are represented in a graph, along with a table of all mailboxes that have received messages from the domain for a specified period of time.
Under Daily message volume, the volume of messages that have been sent for each day for the domain that you selected.