[seen.to]

Not a function as such. Something I add to combat mail injection spammers. I've since added more but this is the version I have at hand:

PHP Code:

$email = preg_replace("/\r/", "", $email);
$email = preg_replace("/\n/", "", $email);
if (eregi("cc", $email) || eregi("bcc", $email) || 
eregi("to", $email) || eregi("Content-Type", $email)) 
die("Sorry, there was a problem with your message being sent. 
Please click <a href=\"javascript:history.go(-1)\">here</a> to try again");