    public function hello($host = '')
    {
        //Try extended hello first (RFC 2821)
        return (boolean)($this->sendHello('EHLO', $host) or $this->sendHello('HELO', $host));
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.