Pimcore\Tool\Newsletter::sendNewsletterDocumentBasedMail PHP Method

    public static function sendNewsletterDocumentBasedMail(Mail $mail, SendingParamContainer $sendingContainer)
    {
        $mailAddress = $sendingContainer->getEmail();
        if (!empty($mailAddress)) {
            $mail->setTo($mailAddress);
            $mail->sendWithoutRendering();
            Logger::info("Sent newsletter to: " . self::obfuscateEmail($mailAddress) . " [" . $mail->getDocument()->getId() . "]");
        } else {
            Logger::warn("No E-Mail Address given - cannot send mail. [" . $mail->getDocument()->getId() . "]");
        }
    }

 public function sendTestAction()
 {
     $document = Document\Newsletter::getById($this->getParam("id"));
     $addressSourceAdapterName = $this->getParam("addressAdapterName");
     $adapterParams = json_decode($this->getParam("adapterParams"), true);
     $adapterClass = "\\Pimcore\\Document\\Newsletter\\AddressSourceAdapter\\" . ucfirst($addressSourceAdapterName);
     /**
      * @var $addressAdapter \Pimcore\Document\Newsletter\AddressSourceAdapterInterface
      */
     $addressAdapter = new $adapterClass($adapterParams);
     $sendingContainer = $addressAdapter->getParamsForTestSending($this->getParam("testMailAddress"));
     $mail = \Pimcore\Tool\Newsletter::prepareMail($document);
     \Pimcore\Tool\Newsletter::sendNewsletterDocumentBasedMail($mail, $sendingContainer);
     $this->_helper->json(["success" => true]);
 }