Originally Posted by Nikon Bob
I had to manually delete it. Notification by email was not selected in my user CP and still isn't, just checked.
Sure you are looking in the right place? There are a couple of different email notifications that are configurable - the one for "Default Thread Subscription Mode" in the Options page would be the appropriate one.
Each time I received unwanted notifications that one had magically changed from "no email" to "instant email". That said, mine was set to "instant" this morning, and changed this evening from "no email" (to which I had set it in the late afternoon) to "no subscription" - so perhaps yours was changed there and back as well...
The behaviour (random value changes) would be very easy to explain if that database table has got got its keys mixed up so that multiple users are using and editing one value, or if the software is somehow storing that value globally (or at any rate for larger user groups) rather than individually.