Hello again,
here is my solution on how to use Postfix + Spamassassin on CentOS in 4 steps:
1) yum install spamassassin
2) useradd spam
3) Add the following line to /etc/postfix/header_checks:
/^Subject: [SPAM]/ DISCARD
4) Add the following lines to /etc/postfix/master.cf:
smtp inet n - n - - smtpd -o content_filter=spamassassin spamassassin unix - n n - - pipe user=spam argv=/usr/bin/spamc -f -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}
More details:
http://serverfault.com/questions/619537/use-postfix-and-spamassassin-package...
Regards Alex