I too have noticed that every since they changed the yahoo email formatting, my spam box has been flooded each day. I've gone from less than 10 spam per day up to 50 each day. I suspect that when they changed the formatting, it somehow also impacted the filter which is now letting alot more through. Even blocking specific emails has not done the trick to bring it back down in numbers. Another example of how they did not test out the new formating as well as they should have before rolling it out.