include.php :

function gen_email($dest,$hash_value) {
  $subject = "Hi";
  $body = "Hi,\n\nHow are you? please do NOT clich here : \n";
  $body .= $base_url."?email=".$dest."&hash=".$hash_value;
  $body .= "\n\nBye\n";
  if (mail($dest, $subject, $body)) {
    echo("<p>Message successfully sent to $dest!</p>");
    } else {
    echo("<p>Message delivery failed for $dest...</p>");
    }
  }

fichier principal :
     while($row = mysql_fetch_array($result)) {
	//echo "email : ".$row['email_address']."<br>";
	gen_email($row['email_address'],$row['hash']);
	}