What data is given to the sender if I opt-out of providing a read receipt? Additionally, Boomerang's read receipts are a bit different than those of other email clients in that they do not require any action on the part of the recipient, if the reader doesn't opt-out then a receipt is given. We do recognize that it can be useful to have some of this information, which is why we have done our best to implement a solution that respects the privacy of the reader while at the same time offering valuable information to the sender. When images are displayed, the sender receives a bunch of information, such as IP address, time of open, type of device the message was opened with, as well as the physical location of the reader. Many other services use a covert form of tracking that involves inserting a 1X1 pixel image into the body of the email. Read receipts are different from traditional click and open tracking in that a recipient can opt-out of providing the data to the sender.
