I think you have to request an email for EVERY individual thread you reply to. So, for example, on this thread in my first reply, I checked the box below the text entry area that says: “Notify me of follow-up replies via email.” You only have to do that once for any given thread, but you have to do it on every thread with at least one reply you make. If you do a reply and haven’t yet checked that box, I haven’t found any method to check the box after the fact. It seems that you have to make an additional entry just to get the box to check and then Submit the reply. Grrr! Pretty weird, but once you do it for a thread, it seems to work OK.