currently, it can go to every admin/moderator that has elected to receive the notification… will have to discuss with Andy where he was thinking of filtering as it could be tricky how to replace…
lots of folks have requested a subscribe to forum feature, but we have frankly resisted because that is what RSS is for… and with limited time we dont want to recreate the wheel… additionally, we get a lot of non technical people who would blindly enable that on their large forums an wonder why their server crawls from sending too many emails and maybe even get questions from their hosts…
actually figured given the simplicity of doing that via an sp plugin in 5.0, someone would have already implemented it… but alas…