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Originally Posted by Sociable
Fair point.
But saying that as we can't eliminate 100% means we shouldn't eradicate a lower percentage that is known to be safe is another matter.
Start with the clear abuse first and work down the list.
Yes even this could result in a few stray messages being caught by the system but only where people are routing mail through insecure or deliberately spam friendly servers. This in turn would lead to people stopping support for those servers and forcing them to clean up their act.
Curiously I can remember a time when the old cabletel email address was on a blacklist because it was using insecure mail servers. AFAIK it was this being blacklisted that concentrated the minds of the ISP to fix the problem.
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Brightmail operates several spam detection systems, but a key benefit is that they have set up a large number of dummy email addresses at many different ISPs (including Demon). Any email sent to these addresses is by definition unsolicited and unwanted. Brightmail then create filtering rules that will detect the same email being sent to other addresses. This scheme means that Brightmail will not block properly run mailing lists, legitimate mailshots to customers or indeed mass emails sent by your friends to invite you to a party. This is because these emails will never reach the dummy addresses and so no rules will be created for them. For more information see:
http://www.brightmail.com/accuracy.html