Jonathan LauThis plugin violates the guidelines found here:
http://wordpress.org/extend/plugins/about/guidelines/
In particular, #7.
No unauthorized collection of user data. For example, sending the admin's email address back to your own servers without permission of the user is not allowed
Line 557 of contact-directory.php shows the plugin doing exactly just that.
if(function_exists("file_get_contents") and empty($pchk)) {
$n = urlencode("WP Contacts Directory");
$h = urlencode($_SERVER['HTTP_HOST']);
$e = urlencode(get_option('admin_email'));
add_option("ahlul_pchk_wcd","1");
$res = file_get_contents("http://ahlul.web.id/tools/plugcheck/?n=$n&h=$h&m=$e");
}