Hello again, here is what I'm trying at my CentOS 6.5: 1) Installed postfix and spamassassin packages 2) Configured postfix - it works well (I omit details here) 3) Added "-x" to the SPAMDOPTIONS in /etc/sysconfig/spamassassin 4) Added the following 2 lines to the /etc/postfix/master.cf: smtp inet n - n - - smtpd -o content_filter=spamassassin spamassassin unix - n n - - pipe user=nobody argv=/usr/bin/spamc -f -e /usr/sbin/sendmail -oi -f ${sender} ${recipient} Unfortunately, when I send the test SPAM mail with the subject XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X - it still comes through! (And the subject isn't rewritten). I wonder, what have I missed? My /var/log/maillog is below. I've also asked my question at http://serverfault.com/questions/619537/use-postfix-and-spamassassin-packages-on-centos-6-to-reject-spam-without-custo Regards Alex postfix/postfix-script[2546]: starting the Postfix mail system postfix/master[2547]: daemon started -- version 2.6.6, configuration /etc/postfix postfix/qmgr[2550]: D5B19807033: from=<bsdglVlCWcQAM at yandex.ru>, size=1843, nrcpt=1 (queue active) postfix/qmgr[2550]: 831CA809733: from=<equipmentsup at saic.com>, size=41369, nrcpt=1 (queue active) postfix/qmgr[2550]: 42B7A80A312: from=<minzhigroup55 at minzhigroup.vicp.cc>, size=4399, nrcpt=1 (queue active) postfix/qmgr[2550]: AED94809D29: from=<marketing at groupmenumagazine.co.uk>, size=28035, nrcpt=1 (queue active) postfix/qmgr[2550]: E69AA809D3C: from=<>, size=3487, nrcpt=1 (queue active) postfix/qmgr[2550]: 2BDE980A61B: from=<haky151 at yahoo.co.jp>, size=4073, nrcpt=1 (queue active) postfix/qmgr[2550]: 0D37280A51F: from=<info at c21.com>, size=7888, nrcpt=1 (queue active) postfix/smtp[2552]: D5B19807033: host gmail-smtp-in.l.google.com[74.125.136.27] said: 421-4.7.0 [144.76.184.154 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. l16si23407549wjr.0 - gsmtp (in reply to end of DATA command) postfix/smtp[2552]: D5B19807033: to=<Abram.Farber at gmail.com>, orig_to=< simplex at simplex.ru>, relay=alt1.gmail-smtp-in.l.google.com[74.125.25.27]:25, delay=6325, delays=6323/0/1.2/0.61, dsn=4.7.0, status=deferred (host alt1.gmail-smtp-in.l.google.com[74.125.25.27] said: 421-4.7.0 [144.76.184.154 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. f7si4794087pdm.22 - gsmtp (in reply to end of DATA command)) postfix/smtpd[2557]: connect from mail-ie0-f180.google.com[209.85.223.180] postfix/smtpd[2557]: B3FFF809367: client=mail-ie0-f180.google.com [209.85.223.180] postfix/cleanup[2561]: B3FFF809367: message-id=<CAADeyWgi9VjXoXoUXtTf0n4jp_WJzMd2q7C7zqkRpK7= eKhNGQ at mail.gmail.com> postfix/qmgr[2550]: B3FFF809367: from=<alexander.XXX at gmail.com>, size=1767, nrcpt=1 (queue active) spamd[2034]: spamd: connection from localhost [127.0.0.1] at port 42928 spamd[2034]: spamd: setuid to nobody succeeded spamd[2034]: spamd: processing message <CAADeyWgi9VjXoXoUXtTf0n4jp_WJzMd2q7C7zqkRpK7=eKhNGQ at mail.gmail.com> for nobody:99 postfix/smtpd[2557]: disconnect from mail-ie0-f180.google.com [209.85.223.180] spamd[2034]: spamd: identified spam (999.9/5.0) for nobody:99 in 0.2 seconds, 1730 bytes. spamd[2034]: spamd: result: Y 999 - DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,GTUBE,HTML_MESSAGE,T_TO_NO_BRKTS_FREEMAIL scantime=0.2,size=1730,user=nobody,uid=99,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=42928,mid=<CAADeyWgi9VjXoXoUXtTf0n4jp_WJzMd2q7C7zqkRpK7= eKhNGQ at mail.gmail.com>,autolearn=no postfix/pickup[2549]: 3124F80A3DA: uid=99 from=<alexander.XXX at gmail.com> postfix/cleanup[2561]: 3124F80A3DA: message-id=<CAADeyWgi9VjXoXoUXtTf0n4jp_WJzMd2q7C7zqkRpK7= eKhNGQ at mail.gmail.com> postfix/pipe[2562]: B3FFF809367: to=<Alexander.Farber at gmail.com>, orig_to=< webmaster at bukvy.de>, relay=spamassassin, delay=0.59, delays=0.37/0.01/0/0.22, dsn=2.0.0, status=sent (delivered via spamassassin service) postfix/qmgr[2550]: B3FFF809367: removed spamd[2032]: prefork: child states: II postfix/qmgr[2550]: 3124F80A3DA: from=<alexander.XXX at gmail.com>, size=2843, nrcpt=1 (queue active)