{"id":1126,"date":"2017-02-20T12:41:39","date_gmt":"2017-02-20T17:41:39","guid":{"rendered":"http:\/\/easy-admin.ca\/?p=1126"},"modified":"2017-08-21T10:15:38","modified_gmt":"2017-08-21T14:15:38","slug":"configuring-spamassassin-for-postfix","status":"publish","type":"post","link":"https:\/\/easy-admin.ca\/index.php\/2017\/02\/20\/configuring-spamassassin-for-postfix\/","title":{"rendered":"Configuring SpamAssassin for Postfix"},"content":{"rendered":"

In the process of receiving email, spamassassin will stand between the outside world and the email services running on your server itself. If it finds, according to its definition rules and configuration, that an incoming message is spam, it will rewrite the subject line to clearly identify it as such. Let\u2019s see how.<\/p>\n

The main configuration file is \/etc\/mail\/spamassassin\/local.cf<\/code>, and we should make sure the following options are available (add them if they are not present or uncomment if necessary):<\/p>\n

local.cf<\/div>\n
report_safe 0\r\nrequired_score 8.0\r\nrewrite_header Subject [SPAM]\r\n<\/pre>\n
    \n
  1. When report_safe<\/strong> is set to 0<\/strong> (recommended value), incoming spam is only modified by modifying the email headers as per rewrite_header. If it is set to 1<\/strong>, the message will be deleted.<\/li>\n
  2. To set the aggressivity of the spam filter, required_score<\/strong> must be followed by an integer or decimal number. The lesser the number, the more sensitive the filter becomes. Setting required_score<\/strong> to a value somewhere between 8.0<\/strong> and 10.0<\/strong> is recommended for a large system serving many (~100s)<\/strong> email accounts.<\/li>\n<\/ol>\n
    Once you\u2019ve saved those changes, enable and start the spam filter service, and then update the spam rules:<\/p>\n
    # systemctl enable spamassassin\r\n# systemctl start spamassassin\r\n# sa-update<\/pre>\n
    Integrating Postfix and SpamAssassin<\/h3>\n
    In order to efficiently integrate Postfix and spamassassin, we will need to create a dedicated user and group to run the spam filter daemon:<\/p>\n
    # useradd spamd -s \/bin\/false -d \/var\/log\/spamassassin<\/pre>\n
    Next, add the following line at the bottom of \/etc\/postfix\/master.cf<\/code>:<\/p>\n
    master.cf<\/div>\n
    spamassassin unix - n n - - pipe flags=R user=spamd argv=\/usr\/bin\/spamc -e \/usr\/sbin\/sendmail -oi -f ${sender} ${recipient}\r\n<\/pre>\n
    And indicate (at the top) that spamassassin will serve as content_filter<\/strong>:<\/p>\n
    \"\"<\/p>\n
    Finally, restart Postfix to apply changes:<\/p>\n
    # systemctl restart postfix<\/pre>\n
    To verify that SpamAssassin<\/strong> is working properly and detecting incoming spam, a test known as GTUBE<\/strong> (Generic Test for Unsolicited Bulk Email<\/strong>) is provided.<\/p>\n
    To perform this test, send an email from a domain outside your network (such as Yahoo!, Hotmail, or Gmail) to an account residing in your email server. Set the Subject line to whatever you want and include the following text in the message body:<\/p>\n
    XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X<\/pre>\n
    And shows the corresponding notice in the logs:<\/p>\n
    Additionally, you can test spamassassin<\/strong> right from the command line:<\/p>\n
    # spamassassin -D < \/usr\/share\/doc\/spamassassin-3.4.0\/sample-spam.txt<\/pre>\n","protected":false},"excerpt":{"rendered":"
    In the process of receiving email, spamassassin will stand between the outside world and the email services running on your server itself. If it finds, according to its definition rules and configuration, that an incoming message is spam, it will rewrite the subject line to clearly identify it as such. Let\u2019s see how. The main … Continue reading Configuring SpamAssassin for Postfix<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"Configuring SpamAssassin for Postfix - HP Server","description":"In the process of receiving email, spamassassin will stand between the outside world and the email services running on your server itself. If it finds, accordin"},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1126","post","type-post","status-publish","format-standard","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/posts\/1126","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/comments?post=1126"}],"version-history":[{"count":0,"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/posts\/1126\/revisions"}],"wp:attachment":[{"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/media?parent=1126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/categories?post=1126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/easy-admin.ca\/index.php\/wp-json\/wp\/v2\/tags?post=1126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}