I have noticed that when I get an email telling me that I have been thanked on a thread, the email includes a list of names that does not necessarily match the names shown when I click on the icon on the thread.
It seems to me that MN is therefore outing MNers who have name changed for a particular thread.
IMO this is not acceptable.
Sometimes posters name change for personal/appropriate reasons, therefore, the fact that their other username will be revealed to the poster they thank should be made clear, so that they can choose not to use the facility.