Yes! Here is an article about how a reader who has purchased a book, bundle, or course, can share their email address with the author(s):

http://help.leanpub.com/en/articles/3892096-how-can-i-share-my-email-address-with-the-authors-of-leanpub-books-i-ve-purchased-so-they-can-add-me-to-their-mailing-lists

To see a list of all the readers who have opted in to share their email address with you, go here:

leanpub.com/YOUR_BOOK/customers_list

...making sure to replace YOUR_BOOK with your book's unique web address.

Regarding bundles, people can opt in their email address on each individual book in a bundle, but they can not opt in on the purchased bundle itself anywhere

For more information on our policy around readers opting in to share their email addresses with authors, please see this article:

http://help.leanpub.com/en/articles/569141-why-don-t-i-get-all-the-reader-email-addresses-is-it-possible-to-see-the-details-of-the-readers-who-purchase-one-s-book

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