<select name="sztuk">
    <option value="0">------- </option>
    <option value="1">1 </option>
    <option value="2">2 </option>
    <option value="3">3 </option>
    <option value="4">4 </option>
  </select>

$message="sztuk: &sztuk\n\n".");
    mail("t@t.t","temat","$message","From:$dane $mail\r\nReply-to:$mail");
echo $text;
    }