can u capture email with clickbank/ 1 click upsell

I have a product I'm going to put on CB. How can I capture the email of my buyers or does clickbank do that automatically?

I thought I remember reading that they did not.

also, has there been any new mention of whether clickbank is doing the 1 click upsell yet?

thanks

you can find the emails in the reporting section in your clickbank account. but the people won't be subscribed to your list.