help to find Spammer on Server

A spammer is on the server who is using php script to send lots of SPAMs to other domains.

The mails are going out as 'nobody@serverdomain.com' and from email is spoofed as random_number@rackshack.net

The email message don't have any link or reference to any domain, but general message like "youre spammed"

Any help, how to corner this Spamming user?
Thanks

 

 

 

 

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