bacn
It's not spam, but it's not from a person, and it's in your inbox. Bacn is an automated notification that you know you might get (Facebook addition, alert from an automated process or sensor), and it's clutter in your inbox. Depending on the type of bacn it is, it might even be "important" clutter. Solution: filter it into your Bacn folder.
The temp sensor was set off when the door was accidently propped open. I got bacn from the alarm system AND the temp monitor.