http://blog.rimuhosting.com/2012/09/20/finding-spam-sending-scripts-on-your-server/
mail.add_x_header = On
mail.log = /tmp/phpmail.log

Your php.ini will be in /etc/php.ini if you are using a RedHat based distro (Centos, Fedora, etc) and in /etc/php5/apache/php.ini if you run a Debian derivative (Ubuntu, etc)

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