function check_email($value) {
return eregi("^([0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-wyz][a-z](fo|g|l|m|mes|o|op|pa|ro|seum|t|u|v|z)?)$", $value);
}

if (empty($name)) {
  $stop .= $lang['feed_err_1'];
}

if (empty($email)) {
  $stop .= $lang['feed_err_2'];
}

elseif (!check_email($email)) {
  $stop .= $lang['feed_err_3']