If you add a leanpub.com email address to your Contacts list in your email app, then you should be able to receive emails from Leanpub. Specifically, you may want to add purchases@leanpub.com to your Contacts list.

Once you have added Leanpub to your Contacts list, here are some instructions for getting a new receipt/invoice email for a purchase you have made:

http://help.leanpub.com/en/articles/110742-how-can-i-get-an-invoice-or-receipt-for-my-purchase-can-i-add-custom-information-to-the-receipt-like-my-company-s-name-and-address

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