I was busy at work today putting the sports section together (apparently there was this tennis match or something), so I didn't check my non-work email until I got home. I came back to find 17 new messages in my inbox, which is unusually high. A lot of them were delivery failure messages, which made even less sense.
Looking through them, it was obvious someone was sending out spam mail with a forged address at my domain. I foolishly setup a catch-all for that domain so everything goes to me. None were angry messages professing eventual death, which was nice. Some were away-from-my-desk messages, others were anti-spam confirm-you're-a-real-person messages. The rest were bounces.
Then I looked in my spam box. There were hundreds of bounces. At least 300.
Thankfully I have Gmail, so cleaning that up was pretty simple.
UPDATE: I wake up, and the same thing happens again.