What does undetermined mean?
An Undetermined message is a message that has been delivered but we have not received any feedback as to what the recipient did with the message. This usually happens when they have received the message but did not open it. We refer to these as undetermined rather than unopened because it can also happen when the recipient’s software is only capable of viewing the plain text version, their email software does not view images, their email software has suppressed the images, or they opened the email while not connected to the Internet.
