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Chapter 12. Fighting Spam > Training the Adaptive Filter

Training the Adaptive Filter

Thunderbird’s adaptive filter requires training. When you first installed Thunderbird, there was no junk filter list. This list is always created, from scratch, based on your training.

Thunderbird stores the spam filter word list in a file named training.dat. This is a binary file, with a file header and a series of variable-length records. Each record consists of a 4-byte hit count, a 4-byte integer specifying how long the token (a word or string) is, and then the token’s contents. A token is usually a single word, although there are cases where it might be a compound word or other information.


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