php undefined index

$colname_Recordset1 = "-1";
if (isset($_POST['email'])) {
  $colname_Recordset1 = $_POST['email'];
}
mysql_select_db($database_test, $test);
$query_Recordset1 = sprintf("SELECT customerid, customeremail, customername, customerlastname FROM customers WHERE customeremail = %s", GetSQLValueString($colname_Recordset1, "text"));
$Recordset1 = mysql_query($query_Recordset1, $test) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);

if (("" == ""))     {
  $updateSQL = sprintf("UPDATE customers SET random_token=%s WHERE customerid=%s",
                       GetSQLValueString($_POST['token'], "text"),
                       GetSQLValueString($_POST['customerid'], "int"));

  mysql_select_db($database_test, $test);
  $Result1 = mysql_query($updateSQL, $test) or die(mysql_error());
}

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