Originally Posted by Rytr
Usually, not always, you will only get one notification per thread that you have subscribed to until you open it.
Actually, when I used it in that contest thread, I definitely got more then 1, but when the posts were spaced out a bit. For instance, if someone spammed 2 pages of nothing but their posts, I didn't get an email for everyone. However, I typically checked my email client back then, and might have gotten 5 or 10, when more like 30 or 50 posts were made