_expect example

        // Validate client hostname         if (!$this->_validHost->isValid($host)) {
            /** * @see Zend_Mail_Protocol_Exception */
            throw new Zend_Mail_Protocol_Exception(join(', ', $this->_validHost->getMessages()));
        }

        // Initiate helo sequence         $this->_expect(220, 300); // Timeout set for 5 minutes as per RFC 2821 4.5.3.2         $this->_ehlo($host);

        // If a TLS session is required, commence negotiation         if ($this->_secure == 'tls') {
            $this->_send('STARTTLS');
            $this->_expect(220, 180);
            if (!stream_socket_enable_crypto($this->_socket, true, $this->getCryptoMethod())) {
                /** * @see Zend_Mail_Protocol_Exception */
                throw new Zend_Mail_Protocol_Exception('Unable to connect via TLS');
            }

/** * Perform LOGIN authentication with supplied credentials * * @return void */
    public function auth()
    {
        // Ensure AUTH has not already been initiated.         parent::auth();

        $this->_send('AUTH LOGIN');
        $this->_expect(334);
        $this->_send(base64_encode($this->_username));
        $this->_expect(334);
        $this->_send(base64_encode($this->_password));
        $this->_expect(235);
        $this->_auth = true;
    }
}

/** * @todo Perform CRAM-MD5 authentication with supplied credentials * * @return void */
    public function auth()
    {
        // Ensure AUTH has not already been initiated.         parent::auth();

        $this->_send('AUTH CRAM-MD5');
        $challenge = $this->_expect(334);
        $challenge = base64_decode($challenge);
        $digest = $this->_hmacMd5($this->_password, $challenge);
        $this->_send(base64_encode($this->_username . ' ' . $digest));
        $this->_expect(235);
        $this->_auth = true;
    }


    /** * Prepare CRAM-MD5 response to server's ticket * * @param string $key Challenge key (usually password) * @param string $data Challenge data * @param string $block Length of blocks * @return string */

/** * Perform PLAIN authentication with supplied credentials * * @return void */
    public function auth()
    {
        // Ensure AUTH has not already been initiated.         parent::auth();

        $this->_send('AUTH PLAIN');
        $this->_expect(334);
        $this->_send(base64_encode("\0" . $this->_username . "\0" . $this->_password));
        $this->_expect(235);
        $this->_auth = true;
    }
}