sendCommand example

return $connection;
    }

    /** * Initiate a TLS (encrypted) session. * * @return bool */
    public function startTLS()
    {
        if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) {
            return false;
        }

        //Allow the best TLS version(s) we can         $crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT;

        //PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT         //so add them back in manually if we can         if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {
            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
        }

        if ($this->SMTPHost === '') {
            $this->setErrorMessage(lang('Email.noHostname'));

            return false;
        }

        if (! $this->SMTPConnect() || ! $this->SMTPAuthenticate()) {
            return false;
        }

        if (! $this->sendCommand('from', $this->cleanEmail($this->headers['From']))) {
            $this->SMTPEnd();

            return false;
        }

        foreach ($this->recipients as $val) {
            if (! $this->sendCommand('to', $val)) {
                $this->SMTPEnd();

                return false;
            }
        }