// Redefine user notification function
if ( !function_exists('wp_new_user_notification') ) {
function wp_new_user_notification( $user_id, $plaintext_pass = '' ) {
    $user = new WP_User($user_id);

    $user_login = stripslashes($user->user_login);
    $user_email = stripslashes($user->user_email);

    $message  = sprintf(__('New user registration on your blog %s:'), get_option('blogname')) . "rnrn";
    $message .= sprintf(__('Username: %s'), $user_login) . "rnrn";
    $message .= sprintf(__('E-mail: %s'), $user_email) . "rn";


      //  @wp_mail(get_option('admin_email'), sprintf(__('[%s] New User Registration'), get_option('blogname')), $message);

        if ( empty($plaintext_pass) )
            return;

        $message  = __('Hi there,') . "rnrn";
        $message .= sprintf(__("Welcome to %s! Here's how to log in:"), get_option('blogname')) . "rnrn";
        $message .= wp_login_url() . "rn";
        $message .= sprintf(__('Username: %s'), $user_login) . "rn";
        $message .= sprintf(__('Password: %s'), $plaintext_pass) . "rnrn";
        $message .= sprintf(__('If you have any problems, please contact me at %s.'), get_option('admin_email')) . "rnrn";
        $message .= __('Adios!');

        wp_mail($user_email, sprintf(__('[%s] Your username and password'), get_option('blogname')), $message);

    }
}