Google sends me reports on the spam we get to one of our mailing lists.

I hadn't seem them in a while and found that they themselves were being sent to the spam folder.

edit - I'd forgotten about this actually, and checked, it happened again today.

It's apparently happening because people send me spam, so I mark it as spam. Because I've marked things sent to that email address as spam, they're saying their own report is now spam. The description of the problem is sounding more python-esque as I continue so I'll stop there.