No, that's unconnected -- I checked, and since you're with a large ISP, probably what happened is that enough people marked DW comment notifications as spam that it's started blocking them. (This is similar to, but not entirely like, what happens when an ISP blocks all mail coming from us as spam, and it just doesn't get delivered in the first place.)

Your best bet is to contact your ISP's support department and let them know that it's not spam.