{"id":2899,"date":"2013-12-11T13:57:00","date_gmt":"2013-12-11T19:57:00","guid":{"rendered":"https:\/\/secure.rosehosting.com\/blog\/?p=2899"},"modified":"2025-07-22T02:30:22","modified_gmt":"2025-07-22T07:30:22","slug":"how-to-install-and-integrate-spamassassin-with-postfix-on-a-centos-6-vps","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-install-and-integrate-spamassassin-with-postfix-on-a-centos-6-vps\/","title":{"rendered":"How to install and integrate SpamAssassin with Postfix on a CentOS 6 VPS"},"content":{"rendered":"
<\/div>\n
Status: This OS is no longer supported<\/h5>\n\n\n\n

This article, “How to install and integrate SpamAssassin with Postfix on a CentOS 6 VPS,” covers a version of CentOS that reached end of life (EOL). It is no longer supported. As such, this guide is no longer maintained. If you are currently operating a server running CentOS 6, we highly recommend contacting RoseHosting’s fully managed support<\/a>. They can upgrade or migrate you to a supported version of AlmaLinux.<\/em><\/p>\n\n\n\n\n\n\n

\"spamassassin\"<\/a>The following article is part 4<\/strong> of our mailserver set-up with virtual users and domains using Postfix and Dovecot<\/a> on a CentOS 6 VPS<\/a>, followed by part 2 <\/strong>which explains\u00a0how to install and set-up the Roundcube webmail interface<\/a> on a linux vps server<\/a> and then part 3<\/strong> which is all about how to set-up an SSL encrypted connection in Postfix, Dovecot and Apache<\/a> using SSL certificates<\/a>.<\/p>\n

In this tutorial we are going to set-up SpamAssassin<\/strong> on one of our CentOS 6<\/strong> linux virtual servers<\/a> and integrate it into our Postfix mailserver set-up<\/a> so it can scan and mark the emails detected as SPAM.<\/p>\n

What is SpamAssassin?<\/p>\n

It is a program released under the Apache License 2.0 used for e-mail spam filtering based on content-matching rules.<\/p>\n

UPDATE THE SYSTEM<\/strong><\/h3>\n

As usual, make sure your CentOS 6<\/strong> linux vps<\/a> is fully up to date by executing:<\/p>\n

## screen -U -S spamc-screen\n## yum update<\/pre>\n
INSTALL SPAMASSASSIN<\/strong><\/h3>\n
Install the SpamAssassin package using yum<\/code> by running:<\/p>\n
## yum install spamassassin<\/pre>\n
SET-UP USER<\/strong><\/h3>\n
create spamfilter<\/code> group used for the user that will run the spamassassin<\/code> service<\/p>\n
## groupadd spamfilter<\/pre>\n
create new user spamfilter<\/code> with a home directory of \/usr\/local\/spamassassin<\/code> and add it to the spamfilter<\/code> group you just created<\/p>\n
## useradd -g spamfilter -s \/bin\/false -d \/usr\/local\/spamassassin spamfilter\n## chown spamfilter: \/usr\/local\/spamassassin<\/pre>\n
CONFIGURE SPAMASSASSIN<\/strong><\/h3>\n
next, configure spamassassin<\/code> by editing \/etc\/mail\/spamassassin\/local.cf<\/code> and adding\/setting the following<\/p>\n
## vim \/etc\/mail\/spamassassin\/local.cf\n\n## Required_hits: This determines the filter balance; the lower the score the more aggressive the filter.\n# A setting of 5.0 is generally effective for a small organisation or a single user.\n# Adjust the strictness score to your organization's needs - a large medical organisation might want  to let email items\n# through that are trying to sell pharmaceuticals, so we might increase the level to a more modest 8.0.\nrequired_hits 5\n## Report_safe:  This line determines whether to delete the item or to move the item to the inbox whilst appending\n# a spam notice to the subject line. The levels for this line are set to either a 1 or 0. A score of 1 will delete the spam item,\n# whereas a score of 0 will send the item to the inbox and rewrite the subject line.\nreport_safe 0\nrewrite_header Subject [**SPAM**]\n## Required_score: This line sets the spam score for all email allowed through to your domain, with levels of certainty set from 0 to 5.\n# Zero would be classified as a legitimate email item, whereas 5 would be an definite 'SPAM' item.  If we set the score to 3 we would catch a\n# lot of unsolicited emails but quite a few false positives would still get through. For our example email server we will use the score of 5,\n# but you can of course set this value according to your preference.\nrequired_score 5.0<\/pre>\n
before we proceed with starting-up the spamassassin<\/code> service, we need to make sure it runs with our newly created spamfilter<\/code> user by editing \/etc\/sysconfig\/spamassassin<\/code> and setting-up the following:<\/p>\n
## vim \/etc\/sysconfig\/spamassassin\n\n# Options to spamd\nSAHOME=\"\/usr\/local\/spamassassin\"\nSPID_DIR=\"\/var\/run\/spamassassin\"\nSUSER=\"spamfilter\"\nSPAMDOPTIONS=\"-d -c -m5 --username ${SUSER} -H ${SAHOME} -s ${SAHOME}\/spamfilter.log\"<\/pre>\n
with all that in place, we are ready to start and enable the spamassassin<\/code> service on system startup using:<\/p>\n
## service spamassassin start\n## chkconfig spamassassin on<\/pre>\n
CONFIGURE POSTFIX<\/strong><\/h3>\n
next thing you need to do is to actually integrate spamassassin<\/code> into postfix<\/code> so it can scan and mark the emails that were detected as SPAM. To achieve this we need to edit postfix configuration file. Edit master.cf<\/code>:<\/p>\n
## vim \/etc\/postfix\/master.cf<\/pre>\n
and add\/edit the following lines:<\/p>\n
smtp      inet  n       -       n       -       -       smtpd -o content_filter=spamassassin\nspamassassin unix -     n       n       -       -       pipe user=spamfilter argv=\/usr\/bin\/spamc -f -e  \/usr\/sbin\/sendmail -oi -f ${sender} ${recipient}<\/pre>\n
then, restart postfix for the changes to take effect<\/p>\n
## service postfix restart<\/pre>\n
\n
TEST THE SET-UP<\/strong><\/h3>\n
To test if SpamAssassin actually works, you can simply send an email with subject  XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X <\/code> to some of your email accounts and once the email is received, check it’s headers and you should notice something like this:<\/p>\n
X-Spam-Flag: YES\nX-Spam-Level: **************************************************\nX-Spam-Status: Yes, score=1000.0 required=5.0 tests=GTUBE,RCVD_IN_DNSWL_NONE,\n    TVD_SPACE_RATIO autolearn=no version=3.3.1\n....<\/pre>\n
This means that SpamAssassin is doing it’s job.<\/p>\n
\n
Implementing SpamAssassin<\/strong> to the mailserver set-up with virtual users and domains using Postfix and Dovecot<\/a> adds another nice feature to the mail server set-up.<\/p>\n
However, there are still other parts missing like digital signatures using opendkim, dovecot sieve filter rules, virus scanning etc for a full-featured mail server. In the next few related articles, we will be adding additional features to the set-up so stay tuned.<\/p>\n
Update: Part 5 – How to install and integrate OpenDKIM with Postfix on a CentOS 6 VPS<\/a><\/p>\n
Update: Part 6 – How to set-up server-side email filtering with Dovecot Sieve and Roundcube on a CentOS 6 VPS<\/a><\/p>\n
\n
Of course, if you are one of our Linux VPS Hosting<\/a> customers, you don\u2019t have to do any of this, simply ask our admins, sit back and relax. Our admins will set this up for you immediately.<\/p>\n
PS.<\/strong> If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>","protected":false},"excerpt":{"rendered":"
Status: This OS is no longer supported This article, “How to install and integrate SpamAssassin with Postfix on a CentOS … <\/p>\n
Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":1351,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1699,1706,1703,13],"tags":[34,124,71,334,220,1152,196],"class_list":["post-2899","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-centos","category-email-servers","category-security","category-tutorials","tag-centos","tag-centos-vps","tag-dovecot","tag-mailserver","tag-postfix","tag-rosehosting","tag-spamassassin","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"\nInstall and Integrate SpamAssassin with Postfix | RoseHosting<\/title>\n<meta name=\"description\" content=\"Learn how to install and integrate SpamAssassin with Postfix on a CentOS 6 server with this comprehensive guide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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