Actually, setting the email address for the CC module to send the middle digits somewhere must be done from the CC module itself.
And, it presently only allows for the entry of a single email address.

One workaround would be to set up an email "forward" alias in your hosting account. Then send emails to that alias. You can set up the alias so that *it* does the forwarding to multiple destinations. Or you could just send to a different address altogether if that address is not having the problem your current one's having.