How to track the email account which send more emails

Is there any way to find the email account which send more emails in a day or hour. Some times from my server many spam email are going out with out the knowledge of email account owner. How is it happening.

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Howdy -- which Virtualmin version are you using, Virtualmin Pro or GPL?

If you're using Virtualmin GPL, we'd encourage you to post your questions over in the forums section, which you can access using the "Forums" link at the top of the page. We monitor those, along with lots of other wonderful folks in the community.