Email notifications for discussions I've participated in

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I flagged a comment as spam (and I note other people have done so as well, yet it's *still there*) and this is causing me to get email notifications every time somebody replies to the thread.

That seems to be a rather non-useful definition of "participated in" — if someone's made a spam post, I don't want to know every time someone's replied to it just because I reported it. (Although, if the spam just gets left up, I can't see why I'd bother reporting it in future, of course…)

I can turn off email notifications for all discussions, of course, but is there a way to turn them off for a specific discussion? There doesn't seem to be anything on the thread that will let me do that (the "bookmark" icon, which might indicate something has an active subscription, is not highlighted).