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Originally Posted by SMHarman
Have a look at my post a few above - the sort of spam filtering NTL are trying to get is for 0 false positive, not 0 spam. This is often done by the spam service provider having hidden mail addresses at most ISPs, if a mail appears in one, it is spam and a rule invented. Thats what Brightmail does. Not sure about the NTL one.
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Yes, I read your post. Going for zero false positives is a good aim. (Although I would argue that if just an aim then it is not good enough.) But as I said, my experience is that they are dropping some non-spam emails.
In particular, they are (or were at the last time I was able to get any information out of them - December last year) using realtime blackhole lists to refuse mail from certain hosts, purely on the basis of the originating address, not the email content. My website has much more detail.
Anyway, if it works for you, that's great for you (although - would you know if a legitimate email had failed to reach you?)