public function addBcc(
        $bcc,
        $name = null,
        $personalizationIndex = null,
        $personalization = null
    ) {
        if ($bcc instanceof Bcc) {
            $name = $bcc->getName();
            $bcc = $bcc->getEmailAddress();
        }
        $this->addRecipientEmail(
            "Bcc",
            $bcc,
            $name,
            $personalizationIndex,
            $personalization
        );
    }