Anyone making any claim like that is a liar. PS: C/R = backscatter. DON'T DO IT.
On Thu, Feb 21, 2008 at 4:01 PM, Jason Gurtz <[EMAIL PROTECTED]> wrote: > > I was just told by a guy trying o sell me www.sendio.com that it > > blocks 100% of all spam with zero false positives! Are you telling me > > he is a liar? > > He's definitely lying. Consider the case when some "protected" employee > signs up for a newsletter....sent by an automated system...unable to deal > with C/R. You just had a false positive. > > Consider the case where a spammer joe jobs me and I get spammed by the > challenge. I will answer the challenge and you get to enjoy the spam too. > There's your false negative. While not trivial, it doesn't seem out of > the realm of possibility that a spammer can automate responding to certain > well known vendors of C/R systems. You now have a whole flood of spam on > your hands since the filters suck due to relying on the C/R. > > The salesperson is obviously ignoring this: > <http://linuxmafia.com/faq/Mail/challenge-response.html> > > > > ~JasonG > > -- > > ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ > ~ http://www.sunbeltsoftware.com/Ninja ~ -- ME2 ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
