How to track down spammer using php spam script?

What are some of the ways to track down a spammer on a servere using a php script to send out junkmail? I'm getting some bounced mails but the only thing it's telling me is that the spammer is using:

X-Mailer: PHPBulkEmailer 1.1 http://www.nukedweb.com/

I'm running cpanel so there's no central web server log for me to peruse through. Help!

 

 

 

 

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