You might have noticed that you haven't been receiving any email notifications of PMs or topic updates from the forums lately. I noticed that, too, but at first wrote it off to me just not checking in too often lately. But I just took a closer look and it looks like my webhost changed the way it authenticates sending email and I needed to make one small change to the settings here in the forums.
So the email notifications should be working now. If you get hit with an initial backlog of lots of message updates, please excuse the flood.