You cannot just "get" event confirmation. This is not how it works. If the server hosting e-mail of the addressee implements this feature and if it is enabled by their local policy, you will receive response (with some receipt) via e-mail at the sender's address. For further detail in requesting of confirmation and tracking, please see:
http://en.wikipedia.org/wiki/Email_tracking[
^].
Practically, you cannot rely on it. One typical case when people request confirmations and rely on them is sending messages within some corporation where the confirmation policy is united for all units and strictly enforced by corporate system administration.
—SA