When you enable Email Tracking on an email, Cirrus Insight will embed a small, transparent image in the email. The embedded image does not contain any personally identifiable information about you.
When a recipient opens a tracked email, Cirrus Insight’s servers are notified. This notification includes the recipient’s approximate location (based on their IP address) and the type of device (i.e. web browser, mobile phone, tablet, etc). No personal information of any kind is included in this notification.