private function Smtp_Ok()
    {
        $_res = str_replace("\r\n", '', fgets($this->Smtp_Socket, 512));
        if ( ! preg_match('/^[23]/', $_res))
        {
            fputs($this->Smtp_Socket, "QUIT\r\n");
            fgets($this->Smtp_Socket, 512);
            return FALSE;
        }
        return TRUE;
    }