cpanel view mail statistics

upon viewing the mail statistics in WHM i see this:

Top 50 local senders by message count
-------------------------------------

1170 7284KB mailnull
1070 42MB user1
679 1446MB user2
671 24MB user3
570 12MB user4


is this an indication that user 2 is basically smoking the server either sending or receiving emails?

customer says he sends a handful of emails per day and receives hundreds of spams.


please advise on what more i can do to verify this, thank you

 

 

 

 

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