somone spammed on my server! Help!

I have a dedicated server. Just a couple of people have accounts on it. I received this email...

from zeus :: Network Monitor <servers@cybromedia.com>

The following IP addresses for hg22.*******.com have been found to be
blacklisted.

69.93.143.***

Blacklist: spammers.v6net.org
Address: spammers.v6net.org
URL: spammers.v6net.org
Verified: 01/22/2005 - 12:33:43 PM
---------------------------------------

I looked at email stats in whm and a domain called fanclub.ro sent out thousands of emails. I've never heard of that name and it isn't listed in the accounts list. I don't know enough about cpanel to do a thorough investigation.

How can I find out if one of my users did this or if I've been hacked?

And how can I stop spam from being sent from my server in future?

Thank you,

Ben.

 

 

 

 

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