He probably meant something along these lines:
# Moderately serious ham hits
# 17.294 21.1387 1.2243 0.945 0.85 1.00 LW_WORDLIST_10
body LW_WORDLIST_10
/(?:\b(?!(?:from|that|have|this|were|with)\b)[a-z\.\,\-\;]{4,18}\s+){10}/
describe LW_WORDLIST_10 string of 10+ random words
score LW_WORDLIST_10 1.0
Note that that test with the punctuation included hits 1.2% of the ham, so
you have to score it low. You have to go up to 20 words before you only hit
spam with that test, at which point you hit about 17% of the spam and no
ham.
The same rule WITHOUT punctuation is safe at 15 words, but will obviously
miss some of the newer spam that now uses punctuation. I haven't yet
checked to see what percentage of stuff is caught by the 20-word rule with
punctuation and isn't caught by the 15 word rule without punctuation.
Loren
