True" QuickBooks has made it easy to keep track of the emails you've sent to your customers. Let's start by creating an invoice for a customer and emailing it to them. Now we'll navigate to the Customer Center. From here, click on the Emails button. Select a customer from the left panel to see a list of the emails that have been sent to them. You'll see information such as the amount and subject. You can sort the emails by clicking on a column header, filter the emails by date, and even do a search. Double-clicking on an item from the list takes you to the form that was sent in that email. Clicking on an email address in the list opens your email application with a blank email to that customer. The email tracking function is also available in the Vendor Center.