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We have had some responses and advice on handling the problems of spam and viruses in e-mail following my recent Tech Talk column on challenge/response, a method that some people like and others do not.
The problem is unlikely to be resolved for some time to come.
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I entirely agree with you on challenge/response systems. They seem to create as many problems as they solve. Although David Webb says a Bayesian filter is an ineffective solution, it is one that works well if used in conjunction with other sophisticated filters.
In our product Spam Blackout, we employ no fewer than six different filters as plug-ins, which gives about a 95 per cent success rate. These are:
1. Bayesian filter
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