I switched from Yahoo Mail to Gmail at just the right time.
I still check my Yahoo account every one or two days, and coinciding almost perfectly with me switching to Gmail, I’ve started getting between three and six emails — every day — that Yahoo’s spam filters don’t get. I typically only read the subject line on them, and they all appear to either be random words strung together or current headlines from news websites. I mark each of these messages as spam, but apparently Yahoo’s filters can’t figure them out.