Horde_Smtp::logout PHP Method

    public function logout()
    {
        if (!is_null($this->_extensions) && $this->_connection->connected) {
            try {
                // See RFC 5321 [4.1.1.10]
                $this->_connection->write('QUIT');
                $this->_getResponse(221);
            } catch (Exception $e) {
            }
            $this->_connection->close();
        }
        unset($this->_connection);
        $this->_extensions = null;
    }