What's the dif between instant e-mail notification and daily?

I like to keep up with a thread, and check instant e-mail notification. But it seems this only lasts one day. However, if I check daily e-mail notification, I think I’ll miss all the posts today, until I get one notification that alerts me to them all. How do I get what used to be continual notification that a thread is growing, even over several days? xo C.

Closing duplicate thread.