My former platform shows "Seen" under each email sent out by the system that has was opened by the recipient/prospect. It is right in the contact page in the "sms, email, vm feed panel." Also, this information might fit in nicely within the "Activity Panel" as well. That way you could see which email they clicked on and viewed, what the date was, and where they went on the site next.This is powerful knowledge when placing manual phone calls and knowing who is engaged with the content and who may be a fake lead all-together. I realize there is a way to view this info in the campaign area, but that is crazy time consuming to find on a lead by lead basis.
HIGHLVL-I-3723