timonecomcastnet tim peters brad clements curious subject line capitalization used indicator either percentage characters caps percentage starting capital letter number words xx supply mod tokenizerpy ill test eventually note tokenizer already preserves case subjectline words experiment showed better folding case away specific context experiment also showed expectations preserving case everywhere didnt make significant difference either error rate subject line special case sun 08 sep 2002 165659 0400 spambayes cap cap word subjects