How can I update all the subscribers (or some of them) to change, for example, whether or not they are “confirmed”? If I import them from constant contact, for example, this would be a good time to ask them to re-confirm that they want to continue receiving our newsletter. However, the import tool (this is in version 3) imports them as confirmed – there’s no option to do anything else. The “Massive changes” tool doesn’t allow us to change the confirmed status.