자료실의 깔끔한 폼메일의 php인데

메일주소만 바꾸면 되는 걸로 알고 있는데

메일이 안와서요.

제가 잘 몰라서그러는데 뭔가 틀린게 있는지 봐주세요...

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<?
  echo"
 <style>
 BODY,TD,SELECT,input,DIV,form,TEXTAREA,center,option,pre,blockquote {font-size:9pt; font-family:tahoma,verdana,ｱｼｸｲ; color:grey}
 </style>
 

 <script>
  function back()
   {
   history.go(-1);
   }
 </script>
 
 <center>
 ";

  if(!$name)
 {
    echo("<br><br><br><br><br><br><b>
     <script>
     document.write('No name...');
     </script>
     <form>
     <input type=button value=' Back ' onclick='back()' style='cursor:hand; background-color:white; border:1 solid black;height:18'>
     </form>
     ");
  exit;
 

 }
  if(!$mail)
 {
  echo("<br><br><br><br><br><br><b>
   <script>
   document.write('No Mail@...');
   </script>
     <form>
     <input type=button value=' Back ' onclick='back()' style='cursor:hand; background-color:white; border:1 solid black;height:18'>
     </form>
     ");
  exit;
 
 }
  if(!$subject)
 {
  echo("<br><br><br><br><br><br><b>
   <script>
   document.write('No subject...');
   </script>
     <form>
     <input type=button value=' Back ' onclick='back()' style='cursor:hand; background-color:white; border:1 solid black;height:18'>
     </form>
     ");
  exit;
 
 }
  if(!$memo)
 {
  echo("<br><br><br><br><br><br><b>
   <script>
   document.write('No contents...');
   </script>
     <form>
     <input type=button value=' Back ' onclick='back()' style='cursor:hand; background-color:white; border:1 solid black;height:18'>
     </form>
     ");
  exit;
 
 }

  $header = "Return-Path: $mail\n";
  $header .= "From: $name <$mail>\n";
  $header .= "Reply-to: $mail\n";
  if($html) $header .= "Content-Type: text/html;"; else $header .= "Content-Type: text/plain;";
  $header .= "charset=euc-kr\n";
  if($html) $memo=nl2br($memo);
  $memo = stripslashes($memo);
  mail("manjuoka@nate.com",$subject,$memo,$header);
  echo"<br><br><br><br><br><br><b><center>Sending......</center>
 <meta http-equiv='refresh' content='3;url=mail.htm'> 
 ";
?>