The email delivery page is where you can view statistics for opened, unopened, bounced, and unsubscribed emails for a survey campaign.
You can view the percentage of opened, unopened, unsubscribed, and bounced emails on the pie chart that is to the left of the page. You can see the statistics for different surveys by clicking the drop-down menu that is located above the pie chart, and selecting the survey you would like to see statistics for. You can select from the 12 most recent surveys that you emailed within the last twelve months.
You can click on a piece of the pie chart to view which recipients fall into that category. For example, to see who opened the email that contained the survey, click on the Opened slice of pie. The grid on the right will populate with all recipients that opened the email.