Recipients of Mailchimp campaigns have the same experience as recipients of Sizle presentations. They’re not told the sender will be notified when the document is opened however this type of tracking is fairly commonplace.

For comparison, you might allow cookies from a website you visit regularly, even though they’ve notified you do you really know the extent to which you’re being tracked by a cookie like GA? A large part of the online community assume at least some part of their activity is being stored somewhere, Sizle doesn’t even come close to the tracking that’s being applied to almost everyone that visits any news media site for example.

We made our own analytics tool from scratch that only gathers a few metrics to support sales teams. If that’s creepy to you I would recommend looking into some of the bigger data giants.