Leanpub readers often love hearing from their favourites authors.
To share your email address with the author of a book you've purchased, so they can add you to their mailing lists, please follow these steps.
Go to your Leanpub library here: https://leanpub.com/user_dashboard/library
Select a book
Tick the box for the option to "Share my email address with the author", under "Email Settings"