I have no idea how that happened. When I originally signed on years ago, I had that setting, but I changed it probably two years ago. I suddenly started receiving notifications a couple of weeks ago.
El Orans:
I have dumped them, so I can't remember exactly. I know I got one Sunday telling me that there was a recent addition to a thread on how to teach disconnecting a low pressure hose.
I know that of the list of threads for which I received notifications on Sunday, only one or two described a true active thread.