Postfix spam attack on Cent Os

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http://serverfault.com – Someone is using my server (probably from insecure form) to send out mass spam email. I had a look at mailq but I cannot seem to find out where to look in order to solve this issue. Is there a way to track down where these spam emails are coming from? I'm using CentOS and Postfix This is part of my main.cf file: sendmail_path = /usr/sbin/sendmail.postfix # newaliases_path: The full pathname of the Postfix newaliases command. # This is the Sendmail-compatible command to build alias databases. # newaliases_path = /usr/bin/newaliases.postfix # mailq_path: The full pathname of the Postfix m (HowTos)