We want to track under interaction with our site. We can place cookies on the users computer when they fill out a form on our site. If we send them an email, is there a way to place a cookie upon the opening of the email? If not, is there another way to identify the user through the receipt of an email? We use some marketing automation programs that can identify a user through the receipt of an email, and then their system tracks page interaction and clicks. We want to do something similar.