postfix, MailScanner, and SpamAssassin on fbsd 5.1

[dave]

Hello,
    I've read the installation howto on the MailScanner home page and have
got postfix and MailScanner to talk to each other. The problem is whenever i
enable the use spamassassin option and restart MailScanner i start getting
errors in my maillog about messages being found but no queue directories and
to enable hash_queue_names and hash_depth in postfix. I do this and it does
not stop the problem, i eventually would also like to add a virus checker,
which one is recommended for use on fbsd 5.1?
    Any help appreciated.
Thanks.
Dave.