On Sun, 9 Mar 2003, Hadmut Danisch wrote:
On Sun, Mar 09, 2003 at 11:49:34AM -0600, wayne wrote:
If you find 5 independent tests that each reduce the spam by 20%, when
combined you will have reduced spam by 99.968%.
If a test blocks 20% of spam, it will let 80% get through.
So a pipe of 5 such tests will let 0.8 ^ 5 = 0.32768 = 33%
through. That pipe will block only 66%.
Lies, damn lies and statistics ;-)
If the 5 rules map to a different part of the address space of all spam
then the filter is 100% effective. That was the point.
_______________________________________________
Asrg mailing list
Asrg(_at_)ietf(_dot_)org
https://www1.ietf.org/mailman/listinfo/asrg