You should be running the final version of the Book Reviews plugin created in Chapter 4, The Power of Custom Post Types, and should have already followed the Saving user-submitted data in custom post types recipe (including changing the post status to draft as indicated in the There's more... section). Alternatively, you can get the resulting files from the code bundle (Chapter 4/ch4-book-reviews/ch4-book-reviews-v11.php and Chapter 6/ch6-book-review-user-submission/ch6-book-review-user-submission-v2.php) and rename ch6-book-review-user-submission-v2.php to ch6-book-review-user-submission.php. Finally, you should have access to a WordPress installation on a hosted web server, as emails are usually not sent when running it on a local installation. Be sure to have access to the email account associated with the website administrator to see the resulting email.