Swift_Transport_EsmtpTransport::doHeloCommand PHP Method

    protected function doHeloCommand()
    {
        try {
            $response = $this->executeCommand(sprintf("EHLO %s\r\n", $this->domain), array(250));
        } catch (Swift_TransportException $e) {
            return parent::doHeloCommand();
        }
        if ($this->params['tls']) {
            try {
                $this->executeCommand("STARTTLS\r\n", array(220));
                if (!$this->buffer->startTLS()) {
                    throw new Swift_TransportException('Unable to connect with TLS encryption');
                }
                try {
                    $response = $this->executeCommand(sprintf("EHLO %s\r\n", $this->domain), array(250));
                } catch (Swift_TransportException $e) {
                    return parent::doHeloCommand();
                }
            } catch (Swift_TransportException $e) {
                $this->throwException($e);
            }
        }
        $this->capabilities = $this->getCapabilities($response);
        $this->setHandlerParams();
        foreach ($this->getActiveHandlers() as $handler) {
            $handler->afterEhlo($this);
        }
    }