Plesk: how to check sendmail / qmail abusers

I have a plesk server and lots of times I see many qmails on top. Is there any way to check what user / script is using qmail a lot?

So far I tried:
/var/qmail/bin/qmail-qstat
messages in queue: xxxx
messages in queue but not yet preprocessed: xxx

But, this is not helping me too much. Any help / suggestion is appreciated.

 

 

 

 

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