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The unknown-8bit trick was designed to deal with unknown bytes in an ASCII message, and it works fine for that. However, I also tried to extend it to handle bytes that can't be decoded using the charset specified in an encoded word, and there it fails because there can be other non-ASCII characters that were *successfully* decoded. The fix is simple: do the unknown-8bit encoding using the utf-8 codec. This is especially appropriate since anyone trying to do recovery on an unknown byte string will probably attempt utf-8 first.