As some of you probably realized, the notifications ("at" symbol) ncfiero.com is the email address that the board uses to mail out notifications for new replies, private messages, etc.
Today I discovered that Gmail routed one to my junk email box, so I added it to my white-list. I'd suggest everyone check your junkmail folder to see if the same happened, or pro-actively add it to the "allowed senders"/white-list in your respective email clients/services.