If you have taken the option for the Outlook Report Message add-in to copy submissions to a secops account then the following should work:
// cause 1 = junk
// cause 2 = not junk
// cause 3 = phish
//
EmailEvents
| where RecipientEmailAddress == "secops@yourdomain"
| extend cause = substring(Subject,0,1)
| where cause == "1" or cause == "2" or cause == "3"
| project Timestamp, EmailDirection, SenderFromAddress, RecipientEmailAddress, DeliveryLocation, Subject, cause
| extend week = week_of_year(Timestamp)
| sort by week asc
| summarize count () by week, cause
| sort by week asc, cause asc
| render columnchart
If you don't want to summarize and instead want the list of submissions then drop the last 4 or 5 lines. If you only want certain types of user submissions then amend the relevant "where" filter.
If your secops account also picks up direct reports then they won't necessarily have the right leading digit in the subject line.
This method does not show admin submissions.
