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Originally Posted by mnw21cam
Me too, but for a different reason:
In all the instances so far when I have let someone else manage my spam filtering, it has been really bad. With my own spam filters, I get zero false positives, and hardly any false negatives.
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Originally Posted by Toreador
Filtering by content is one thing, and shouldn't be done by the ISP - apart from virus-containing attachments that could easily be blocked, either by bouncing the email or removing the attachment. Filtering by origin is a different matter and is what other ISPs seem to do.
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The brightmail / demon setup works like this... Brightmail have set up a few thousand email accounts globally. These accounts have never been revealed on the internet. If a mail goes to one of these accounts, by default it must be spam, as mail has never been solicited to these accounts. This is then parsed to establish a pattern and that is added to the demon filters.
If you send a mail to them, it is manually reviewed to ensure it is not solicited before being added to the system.
It works brilliantly, and misses about 10% making my mail far more managable.
Grahams line of business would be irrelivant for the above reasons.