This is happening again. It seems to be concentrated on new games, but there was a post in one of my games half an hour ago, and I still have yet to receive a notification of said post.
(I've checked to make sure I'm set to be notified and I've checked to make sure it's not in my junk folder or sorted somewhere else.)
My e-mail address is a gmail address. This might sort itself out like it did last time, but still thought it was worth mentioning.
EDIT: I figured out what the problem was, and why it was happening only to new games. Problem was on my end and (I think) has been rectified.