php email flash

hi, using flash and php script I try to send mail from my website (linux
hosting)

The script is working but if I enable the marked lines    (//....)  the
script doesn't want to send mail .....

any idea?

name, subject, message & email are vars from the flash (post)
_parent.loadVariables("form.php",  "POST");
Thanks!


$to = "naam@mydomain.com";
$msg =  "Mail afkamstig van: " ;
$msg .= "$name\n\n";
//$msg .= "Emailadres: ";
//$msg .= "$email\n";
//$msg .= "Boodschap: ";
//$msg .= "\n\n";
$msg .= "$message\n\n";

mail($to, $subject, $msg, "From: Mijn web site\nReply-To: $email\n");