So far, 25% of spam emails have gotten through. I redirected an all spam eamil address to my new gmail account, and of 100% spam, 25% got through their filter.
589 caught
143 slipped though
This was over the course of 2 weeks.
I’m going with an open-exchange server on https and spam assassin with exim.
Yahoo’s isn’t much better either probably, although I haven’t tested it yet.