public function addCc(
        $cc,
        $name = null,
        $personalizationIndex = null,
        $personalization = null
    ) {
        if ($cc instanceof Cc) {
            $name = $cc->getName();
            $cc = $cc->getEmailAddress();
        }
        $this->addRecipientEmail(
            "Cc",
            $cc,
            $name,
            $personalizationIndex,
            $personalization
        );
    }