is bayes working ?

[Wimpy]

Hi all,           I have installed spamassassin in my linux machine and also bayes. To train it, as a user I ran the command   sa-learn --showdots --mbox --spam /var/mail/spam_mail and sa-learn --showdots --mbox --ham /var/mail/nonspam_mail   also in my ~/.spamassassasin, in user_prefs, I have included use_bayes 1 bayes_min_ham_num       3 bayes_min_spam_num      3   and when I run the command sa-learn --dump, it shows the no. of nspams and also the scores assigned. But all the scores assigned is 0.5   but the problem is when I feed the same email, it doesnt mark it as spam .       How do I know whether bayes is working or not ?   Please help   have i missed anywhere ???