To solve this issue, you need to remove the bayes files from the previous version of spamassassin and then rebuild the email addresses using the follwoing commands:
rm -f /var/qmail/mailnames/*/*/bayes_toks
rm -f /var/qmail/mailnames/*/*/auto-whitelist
rm -f /var/qmail/mailnames/*/*/auto-whitelist.lock
rm -f /var/qmail/mailnames/*/*/bayes_seen
rm -R -f /var/qmail/mailnames/*/*/.spamassassin
rm -f /var/qmail/mailnames/*/*/user_prefs
rm -f /var/qmail/mailnames/*/*/spamcheck*
/usr/local/psa/admin/bin/mchk –with-spam
