Email Overlay View is the area of the application that should provide the data on link performance for a specific email, including Total Clicks and Unique Clicks. Email Overlay View shows a visual representation of your email with metrics for each link, such as how many times it was clicked, by whom, and when. You can access Email Overlay View from the Tracking tab by selecting an email send and clicking on View Email Overlay. Send Performance Tab shows metrics for an email send, such as Sent, Delivered, Opens, Clicks, etc., but not for each link. Tracking Conversions Tab shows metrics for conversions that occurred as a result of an email send, such as purchases, sign-ups, downloads, etc., but not for each link.