Due to a technical issue that we're working on, email generated by the forum (such as new account notifications, private message notifications, and topic reply notifications) have not been working for a few days. Unfortunately, it's going to be a few additional days for this to be resolved as we have to locate and track down some issues. Until then, you won't receive email notifications from the forum.
Once we fix the problem, we'll post here with an update. Also, until that time, undelivered messages will queue up, and you will eventually receive them.
If you are waiting for your new forum account to be activated, you won't receive the notification message--just attempt to log on after a day or two. (You can try as often as you want--it won't hurt anything.)