protected function sendNewsletter(Email $objEmail, Result $objNewsletter, $arrRecipient, $text, $html, $css=null)
	{
		// Prepare the text content
		$objEmail->text = StringUtil::parseSimpleTokens($text, $arrRecipient);

		if (!$objNewsletter->sendText)
		{
			// Default template
			if ($objNewsletter->template == '')
			{
				$objNewsletter->template = 'mail_default';
			}

			$objTemplate = new BackendTemplate($objNewsletter->template);
			$objTemplate->setData($objNewsletter->row());
			$objTemplate->title = $objNewsletter->subject;
			$objTemplate->body = StringUtil::parseSimpleTokens($html, $arrRecipient);
			$objTemplate->charset = Config::get('characterSet');
			$objTemplate->recipient = $arrRecipient['email'];

			// Deprecated since Contao 4.0, to be removed in Contao 5.0
			$objTemplate->css = $css;

			// Parse template
			$objEmail->html = $objTemplate->parse();
			$objEmail->imageDir = System::getContainer()->getParameter('kernel.project_dir') . '/';
		}

		// Deactivate invalid addresses
		try
		{
			$objEmail->sendTo($arrRecipient['email']);
		}
		catch (\Swift_RfcComplianceException $e)
		{
			$_SESSION['REJECTED_RECIPIENTS'][] = $arrRecipient['email'];
		}

		// Rejected recipients
		if ($objEmail->hasFailures())
		{
			$_SESSION['REJECTED_RECIPIENTS'][] = $arrRecipient['email'];
		}

		// HOOK: add custom logic
		if (isset($GLOBALS['TL_HOOKS']['sendNewsletter']) && \is_array($GLOBALS['TL_HOOKS']['sendNewsletter']))
		{
			foreach ($GLOBALS['TL_HOOKS']['sendNewsletter'] as $callback)
			{
				$this->import($callback[0]);
				$this->{$callback[0]}->{$callback[1]}($objEmail, $objNewsletter, $arrRecipient, $text, $html);
			}
		}
	}