As mentioned in previous posts (Blog post May 9th 08 and Blog post May 14th 08) we have been paying particular attention to the False negative rate of the copy of M-Switch Anti-Spam running here at Isode's offices. We wrote a whitepaper on our findings:
The whitepaper included graphs showing the daily quantities of Spam we received and the daily False Negative rate going back over 4 months (up to 30th April). We always intended to keep these graphs up to date so that they would continue to track M-Switch's performance and today we've updated them to include May's figures.
We will continue to update these graphs, at the end of each month, so that they always show current data.