In a certain group, in which I also happen to be a mod, I set myself to No Email in December, before these changes went into effect (this is in my activity log). Later, and I believe this was in early March, after the changes went into effect (it is not logged, but I remember why I wanted to start following messages there, and it had to do with something that occurred in early March), I set myself to Following Only. That was post-changes. So at that point, I believe the system tried, as described above by Mark, to force-set me to Individual Messages. But that seems not to have worked. I am marked Individual Messages in name only: on my Subscription page and my Member page (as seen by moderators). Whereas in the Member List (as seen by moderators) and in the My Groups page, I am still No Email. And that is the true setting, because I in fact receive no email.