Keep us posted on this. I have an old @sbcglobal.net email address and am getting flooded with notifications too. I have gone in and turned them all off to no avail.I believe that I have found a hack as far as email notifications.
I'm opening threads as I get the notifications, going to the top and selecting "unwatch", then select "watch", being sure to select "watch without email notifications".
I believe this is working.