ok i have this site adn i have added a nice custom 404 that also emails me where the person was and were they were trying to get to. its all working great appart from im getting 100's of emails with this:-

Requested Page: /404.php
Referred By: page removed so as not to advertise
Remote Addr: 197.15.81.160 ()
Request URI: /404.php

and i dont know why the 404 is causing this error any help or suggestions would be lovely!