private function getRecipient($recipientType)
    {
        $returnList = array();
        if (!empty($this->recipientList[$recipientType])) {
            foreach ($this->recipientList[$recipientType] as $recipientItem) {
                $recipient = '';
                if (!empty($recipientItem[1])) {
                    $recipient .= $this->addEncodeTag('"' . $this->recipientItem[1] . '"') . ' ';
                }
                $recipient .= '<' . $recipientItem[0] . '>';
                $returnList[] = $recipient;
            }
        }
        return implode(', ', $returnList);
    }