Question Outgoing Mail Control: How can I see how many emails is each email account sending?

[VojkanC]

I get notification in Outgoing Mail Control Probable spam for a domain abcdef.com.
How can I see how many emails is each email account on abcdef.com domain sending per day?

This is very important for finding and stopping SPAM email being sent from a server.

Can someone please help?

OS ‪CentOS 6.10 (Final)‬
Plesk Onyx Version 17.8.11 Update #32