JBZoo\Utils\Email::_isValid PHP Method

    private static function _isValid($email)
    {
        if (empty($email)) {
            return false;
        }
        $email = filter_var($email, FILTER_SANITIZE_STRING);
        if (filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
            return false;
        }
        return true;
    }