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According to /usr/share/spamassassin/23_bayes.cf BAYES_90 is no longer used, and is now BAYES_95
And this file must be renamed & edited:
[root@sme7 ~]# rpm -q --whatprovides /etc/e-smith/templates/etc/mail/spamassassin/local.cf/40customScore_BAYES_90
smeserver-spamassassin-1.3.0-05