For emails you send, the add-in shows the number of people who have read, forwarded, and replied, as well as a lifespan chart showing the email’s read activity. You’ll only see these statistics for emails you’ve sent to at least five people, and you can’t identify who read or forwarded the email.
For emails you receive, the add-in gives you information about your relationships with colleagues, including the number of emails you’ve exchanged, your average response times, and the percentage of their email you read. Only you have access to your personal relationship statistics.