You can also make a small modification on the showprofile.php to scramble the emails of users that are registered so that the email spiders are being fed with junk (a good way to pay them back). This alteration assumes that you have the IIP installed.
require_once("./pals/spiderfood.php");
if ($thisuser['U_Number'] < 2) {
$Fakeemail = screwy_Mail($Fakeemail);
$ICQ = screwy_Mail($ICQ);
$Extra2 = screwy_Mail($Extra2);
$Extra3 = screwy_Mail($Extra3);
$Extra4 = screwy_Mail($Extra4);
$Extra5 = screwy_Mail($Extra5);
}