I have no personal spam filters. My ISP (Comcast) does trap a few domains but I turned that trapping off when I discovered it a while back. Maybe I should see if they've turned it on again, but I don't have this problem with other forums except for selected threads in one other forum. None of my threads here (like this one) get notifications.

Check your website settings 'my profile'. Found yesterday that wcg had a rejected "mail is real" test and logged this with a 550 error, my mail provider refusing to respond. One could interpret this as wcg being considered a spammer or hacker if they do this in the bulk by the hundreds and thousand. Per uplinger cycled the address to reset and see if the test passes this time. So far nothing received in watch responses, which is logical as the reset did take place after the last watched thread post.