Webiny\Component\Mailer\Bridge\SwiftMailer\Message::setBcc PHP Method

    public function setBcc($bcc)
    {
        if ($bcc instanceof Email) {
            $bcc = [$bcc];
        }
        foreach ($bcc as $email) {
            if (!$email instanceof Email) {
                throw new MailerException('Email must be an instance of \\Webiny\\Component\\Mailer\\Email.');
            }
            $this->addBcc($email);
        }
        return $this;
    }