Thanks to everyone who is replying here. Additional replies/comments always appreciated.
What started me thinking about this is this non-intuitive but mathematically valid "paradox" that Bookworm and others have noticed: If 95% of all email is spam, and I correctly tell users that I block 95% of all spam, they might think that 5% of their email will be spam, but it's actually ~50%. Reasoning: for every 10000 emails that come in, 9500 are spam, 500 ham. I catch 95% of the 9500 spams or 9025 spams, leaving 475 spams in the users inbox. 475 spams + 500 hams (assuming no FP) is a 48.7% spam ratio. I guess most of the "official" statistics I see are of the form "this catches 99% of all spam", which makes my end users think they should be seeing only 1% spam. It would be nice to see "this reduces your inbox spam %age to 10%" type of statistics. -- We're just a Bunch Of Regular Guys, a collective group that's trying to understand and assimilate technology. We feel that resistance to new ideas and technology is unwise and ultimately futile.
