public function setWithRecipient($withRecipient = true)
    {
        $this->isBool($withRecipient, 'withRecipient');
        $this->withRecipient = $withRecipient;

        if ($withRecipient === false) {
            $this->recipientLine1 = '';
            $this->recipientLine2 = '';
            $this->recipientLine3 = '';
            $this->recipientLine4 = '';
        }

        return $this;
    }