Yes you are right. Setting up auto-forwarding will be required in your email and this will be a one time task. While uploading will be manual process every month.
Even now the emails are being forwarded to the same email address so nothing will change if we implement any of these options. Also the CAS does not have any sensitive data. Having said that, we do take safety of our user’s data very seriously so irrespective of how you share the CAS with us, we ensure that your data is not compromised.