(Leanpub cofounder here.) We changed this very recently: readers can new choose a checkbox to share their email with the author, and this checkbox is on the pu

(Leanpub cofounder here.) We changed this very recently: readers can new choose a checkbox to share their email with the author, and this checkbox is on the purchase form as well as on the reader dashboard. (And, being Canadian, I feel the need to apologize. So, we are sorry it took us so long to get this feature right!)