Mail sent to the "junkmail" and "notjunkmail mailboxes" for automatic training may not be used to train the database in the correct location.
If this happens, follow these steps to resolve the issue:
# mv /var/amavis/.spamassassin /var/amavis/.spamassassin.old
# ln -s /var/clamav/.spamassassin /var/amavis/.spamassassin