On 07/05/2010 04:19 PM, Bjoern Meier wrote: ```hi, 2010/7/5 Eduardo M KALINOWSKI : . No system will ever be 100% accurate ``` ```and filter all spams. ``` ```Right. But less then 99.8% - for a private system (which the list is not) - is not tolerable. Can the list track how spam is blocked and - maybe - an overview how effective this is (like graphs over a few periods)? greetings, Björ``` Hi, just some obvious calculations: assuming that all blocked emails are indeed spams, we have: blocked-spams / all-spams = blocked-mail / ( blocked-mail + not-blocked-spam ) So, blocked-spams / all-spams = 0.95 / ( 0.95 + 0.05 * (not-blocked-spam / legitimate-mails) ) Y = X/(1-X) * (1/A -1) in which, A: blocked-spams / all-spams X: blocked-mail / all-mails Y: not-blocked-spam / legitimate-mails Assuming the goal is to have blocked-spams / all-spams higher than "0.998", it can be shown that (not-blocked-spam / legitimate-mail) must be less than 0.038. And I think it is. Conclusion: The system is good enough. Yours truly, Eliad