setup spamassassin

hello there,
I have centos v6.4 and I have installed spamassassin by doing this "yum install spamassassin"

but for some reason everything seems to be running okay, postfix with dovecot and also spamassassin but no emails are being marked as spam while using test subject line "XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X"

I also edited the conf file "/etc/mail/spamassassin/local.cf" to something like this
rewrite_header Subject [SPAM]
required_score           2.0
report_safe     0
use_bayes               1
use_bayes_rules         1
bayes_auto_learn        1
skip_rbl_checks         0
use_razor2              0
use_pyzor               0

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>dovecot.conf
protocols = imap pop3 lmtp

!include conf.d/*.conf

#log_path = /home/virtual/email/dovecot.log
#info_log_path = /home/virtual/email/dovecot-info.log

# Disable SSL for now.
ssl = no # v1.2+, for older versions use: ssl_disable = yes
disable_plaintext_auth = no

mail_location = maildir:/home/virtual/email/%u/
#mail_location = maildir:~/Maildir

# Authentication configuration:
auth_verbose = yes

auth_mechanisms = plain login
passdb {
  driver = passwd-file
  args = /home/virtual/email/passwd
}
userdb {
  driver = static
  args = uid=vmail gid=vmail home=/home/virtual/email/%u/
}

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>postfix main.cf
## These settings differers from the default config ##
myhostname = domain.net
mail_owner = postfix
mydomain = domain.net
myorigin = $mydomain
inet_interfaces = all
inet_protocols = all
mydestination = localhost, mail.localdomain, localhost.localdomain, localdomain
unknown_local_recipient_reject_code = 550
in_flow_delay = 1s
home_mailbox = Maildir/
mail_spool_directory = /home/virtual/email
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

## The following is added to the config ##
local_transport = virtual
virtual_mailbox_domains = /home/virtual/email/domains
virtual_mailbox_base = /home/virtual/email
virtual_mailbox_maps = hash:/home/virtual/email/virtual
#virtual_alias_domains = /home/virtual/email/domains
virtual_alias_maps = hash:/home/virtual/email/alias
virtual_minimum_uid = 100
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000

smtpd_helo_required = yes
disable_vrfy_command = yes
smtpd_recipient_restrictions =
        reject_unauth_pipelining,
        permit_sasl_authenticated,
        permit_mynetworks,
        reject_invalid_hostname, reject_non_fqdn_hostname,
        reject_non_fqdn_sender, reject_non_fqdn_recipient,
        reject_unknown_sender_domain, reject_unknown_recipient_domain,
        reject_unauth_destination, 
        permit
smtpd_data_restrictions = reject_unauth_pipelining, permit

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Daniel HelgenbergerCommented:
Hello,

spamassassin works by 'piping' new mails through it. I think since you did not post your master.cf, you missed this step.

cat /etc/postfix/master.cf
...
smtp        inet   n           -           n          -             -              smtpd -o content_filter=spamassassin
spamassassin unix - n n - - pipe flags=R user=spamd argv=/usr/bin/spamc -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}
...

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Here is another guide which mentions this step. The rest of the config looks ok at first glance.
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