I would recommend setting up a separate gmail account specifically for Book Review Targeter. You can name it something like firstname.lastname@example.org. It's very easy to create a gmail account or you can go on fiverr to have someone set that up for you very quickly.
Next, you will have to set up this 2-step verification:
2. Set Up Your SMTP
Before you run reviews, you should set up your SMTP so that you will be able to send emails through the tool. Go here for more training on SMTP Setup: Click Here