    public function hello($host = '')
    {
        //Try extended hello first (RFC 2821)
        return (boolean)($this->sendHello('EHLO', $host) or $this->sendHello('HELO', $host));
    }
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.