You can view the list of people who have viewed your email campaign by going to Email > Sent Emails. Click the green envelope or choose "Recipients and Pickup Status" from the options drop-down menu.
On this screen, you will see statistics for each recipient including whether they viewed the email and how many times.
To export your email campaign stats as a .csv comma delimited file that can be imported into other programs:
Important Note: If your email recipient has turned off the display of images in their email software, they can still view the message text but we do not record that they viewed your email.