You know the same thing just happened to me, I thought I was going crazy. I just got an email about a PM that I got, read, responded to and deleted a week and a half ago. I went to the Technical board and there is a thread on there about NOT getting emails and the webmasters said there was a problem that they were in the process of fixing. Once the problem was adjusted it seems to have been sending out the emails that it was holding so "old" email notifications are coming through late.