Thanks for your reply falko !!!
The tutorial I was using was:
Virtual Users And Domains With Postfix, MailScanner, Mailwatch & MySQL On CentOS 5.1
I also took a look a the Perfect SpamSnake but I am still having the same problem. Using mailwatch there is an error pointing to bayes_* files in /var/spool/Mailscanner/spamassassin directories.
Any thoughts about the issue ?
UFCSPA - Brazil