php mail（）删除CC，BCC和安全性

I'm new to stackoverflow and couldn't find an answer to my question which is; How do I secure my mail() code in php to prevent people from adding bcc which would ultimatly result in mass mailing? My website uses the PHP mail() service to email me when a new comment has been entered in my site. What is the best way to prevent people tampering with it, such as removing the bcc? What I have so far is:

function mres($input){
if (get_magic_quotes_gpc()){
    $input = stripslashes($input);
}
return mysql_real_escape_string($input);
}
$name = strip_tags(mres($_POST['name']));
$comment = strip_tags(mres($_POST['comment']));

$to = 'myself@gmail.com';
$subject = 'Website - comment';
$body = 'A new comment has been entered on the website.'."

"."$name".' said:         '."

"."$comment";
mail($to,$subject,$body);