Yes, it could -- but I have 400 users, 10 forums, and about 2 new threads a week (not day) -- total, across all forums. So, I'd be looking at about 800 emails a week.
Most of my audience is accustomed to (and seems to prefer) listservs; I want to use this hack to get a bit more "in their face" -- so that when there is a new thread, they will be (hopefully) encouraged to visit the forums and add their own posts.
Of course, when/if the activity at my forums picks up, I would revert back to making the subscribe feature optional by default -- and then only those who want it could turn it on. (That's the way it runs now.)
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