address bulk capture captured checkout chooses customer email emails folder google google-checkout private regular save seller send sends user visible

I noticed that the customer's regular email address is not captured, and only the checkout google email is.
Is there a way to capture the regular email address and also save it in a bulk email folder for future emails I may send?

We can only capture the address that Google Checkout sends us. Google Checkout sends us the private email address if user chooses not to make the email address visible to the seller.