This makes absolutely no sense, but I seem to only get new emails from the llamaserver when I delete the old one. If I just wait and don't delete the last one, I can wait for hours and not get another email. If I delete it I get one within the hour. Bizarre.
Personally I've gotten over 100 emails for revised turns in the past couple days, but only for one of the three games I'm playing that are hosted on llamaserver.