[CentOS] find out which website is used for sending email?

Tue Oct 27 17:32:53 UTC 2009
John R Pierce <pierce at hogranch.com>

Lucian @ lastdot.org wrote:
> What you need is this:
> http://choon.net/php-mail-header.php
>
> But this requires recompiling PHP..
>   

you're assuming this is being done via PHP, it could as easily be coming 
from a bad perl CGI or another similar exploitable web service.