The following code won't send me an email...anyone know why?

Code:
 $header = "From: $email\nReply-To: $email\nX-Mailer: Purchasing System by Richard Brevig\n";
 $header .= "Content-Type: text/html; charset=\"iso-8859-1\""; 
 $subject = "New Purchase In Que";
 $body = "There is a new order in place to be processed.  There may be more by now, however, you will not receive another email notification until you log back into the Admin section.";
 mail($email,$subject,$body,$header);
$email is defined.

Thanks.

Richard