I bet anybody $1000 that I could save the co-op $90K/year with IMgate and after the users got past the "change hurts" false problem, the anti-spam effectives would be equal.
I hate to ask, Len, but do you have any numbers that show what % of false positives your solution would provide? If you have no idea whether you are blocking 1 in 2,000 legitimate E-mails, or blocking 1 in 20 E-mails, you can't compare your solution with theirs. :)
Although rejecting E-mail at the SMTP level is very nice, it does make it nearly impossible to detect false positives. And blocking E-mail on a single criterion (as quite a few anti-spam programs are now doing) is bad. Much worse, though, is blocking E-mail on many single criterion -- for example, if you have 10 different spam tests that you block E-mail on, and each has a 1% FP ratio, you will now be blocking somewhere around 5% of your legitimate E-mail (sorry, I don't have time to make the exact calculation right now).
We've noticed that a lot of the new anti-spam companies are headed for serious trouble, and we're trying to stop that by urging all anti-spam companies to make sure that they do not by default (or by recommendation) block E-mail on any single criterion. With even the best spam tests catching 1% or more of legitimate E-mail, it just doesn't make sense to block E-mail based on one test (with a few very rare exceptions).
-Scott
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