No worries.
The problem with setting up that kind of filter is it's very difficult to make it work on just spam emails, and ignore ligitimate emails wheer you have been added as a BCC... My email programme at work even assumes any email you recieve where you aren't directly in the TO or the CC means you MUST be a BCC. just using that presumtion would mean every main would get to you
I think they're more focussing on getting the servers to reliably deliver mail first - then they'll focus on getting rid of the spam :/
Hope that helps.