javascript method for verifying email addresses and MX records

This article illustrates the javascript method for verifying email addresses and MX records. Share to everybody for everybody reference. The details are as follows:

// Tests for a valid email address and optionally tests for valid MX records, too.
function is_valid_email($email, $test_mx = false)
{
  if(eregi("^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email))
    if($test_mx)
    {
      list($username, $domain) = split("@", $email);
      return getmxrr($domain, $mxrecords);
    }
    else
      return true;
  else
    return false;
}

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