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The filter improves as it watches how you sort your e-mail, and with time the filter will reach nearly 100% classification accuracy. More important, however, is that the filter is intentionally conservative in what it marks as junk mail. If Thunderbird can't quite decide whether an e-mail is junk or not, it will mark it as not spam. It's that simple -- after training, the filter simply doesn't create false positives.
== Links ==
* http://www.mozilla.org/mailnews/specs/spam/