Example of mail()

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Hi all.
    
    In the code bellow you'll find an easy to use example of mail(). 
    
    I know it's very simple but the question is: How can I erase the 
  values  held in $_REQUEST such that when I press F5 or I click "Reload" 
  there  are no messages sent again?
    
    Thanks a lot for your help.
    
    
    Best Regards
    
    
    RENZO CLAVIJO
    
    PD: Please forgive me if my english is not OK
  
  
  
  --------------
  
  
  <html>
  <head>
  <title>Correo</title>
  </head>
  
  <body>
  
  <form name="form_send" method="post" target="<?php echo $_REQUEST['PHP_SELF'];?>">
  
  Address: <input type="text" name="address_mail" size="20">
  <br>
  
  Subject: <input type="text" name="subject" size="20">
  <br>
  
  Message: <input type="text" name="message" size="20">
  <br>
  
  <input type="submit" name="send_mail" value="Enviar">
  
  </form>
  
  </body>
  
  <?php
  if(isset($_REQUEST['send_mail'])){
      mail($_REQUEST['address_mail'],$_REQUEST['subject'],$_REQUEST['message']);
  }
  ?>
  
  </html>
  
  
  
  
  
  
		
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