{"id":3025,"date":"2014-01-10T12:48:42","date_gmt":"2014-01-10T18:48:42","guid":{"rendered":"https:\/\/secure.rosehosting.com\/blog\/?p=3025"},"modified":"2025-07-22T03:39:52","modified_gmt":"2025-07-22T08:39:52","slug":"how-to-set-up-server-side-email-filtering-with-dovecot-sieve-and-roundcube-on-a-centos-6-vps","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-set-up-server-side-email-filtering-with-dovecot-sieve-and-roundcube-on-a-centos-6-vps\/","title":{"rendered":"How to set up server-side email filtering with Dovecot Sieve and Roundcube on CentOS 6"},"content":{"rendered":"
<\/div>\n
Status: This OS is no longer supported<\/h5>\n\n\n\n

This article, “How to set up server-side email filtering with Dovecot Sieve and Roundcube on CentOS 6,” 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 As such, this guide is no longer maintained.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

\"Install<\/a>The following article is part 6<\/strong> of the mailserver set-up with virtual users and domains using Postfix and Dovecot<\/a> series. It covers the steps used to set-up server-side email filtering with Dovecot Sieve and Roundcube<\/strong> on a CentOS 6 VPS<\/a><\/p>\n

At the end of this article you will end up having the ability to set-up your own server-side mail filter rules<\/strong> and automatically deliver emails to specific maildir<\/strong> based on a filter rule.<\/p>\n

What is all this about?<\/p>\n

The project behind this is known as Pigeonhole<\/strong>. It’s great because it adds support for the\u00a0Sieve language<\/a>\u00a0(RFC 5228<\/a>) and the\u00a0ManageSieve protocol\u00a0(RFC 5804) to the\u00a0Dovecot Secure IMAP Server<\/a>. Additionally, one can easily manage these filter rules via Roundcube’s web interface.<\/a><\/p>\n

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

Before proceeding any further, make sure you are in a screen session and check if your CentOS<\/strong> Linux VPS<\/a> is fully up-to-date by running:<\/p>\n

## screen -U -S sieve-screen\n## yum update<\/pre>\n
\n
ENABLE DOVECOT MANAGE-SIEVE<\/strong><\/h3>\n
In order to enable ManageSieve<\/strong> protocol in Dovecot<\/strong> we need to install the dovecot-pigeonhole<\/code> package using ‘yum’<\/p>\n
## yum install dovecot-pigeonhole<\/pre>\n
Once the package is installed, navigate to dovecot’s configuration directory in \/etc\/dovecot<\/code> and edit the main configuration file dovecot.conf<\/code><\/p>\n
## cd \/etc\/dovecot\n## vim dovecot.conf<\/pre>\n
set protocols<\/code> to<\/p>\n
protocols = imap lmtp sieve<\/pre>\n
add auth-master<\/code> unix-listener to service auth<\/code><\/p>\n
service auth {\n    unix_listener auth-client {\n        group = postfix\n        mode = 0660\n        user = postfix\n    }\n\n    unix_listener auth-master {\n        group = vmail\n        mode = 0660\n        user = vmail\n    }\n\n    user = root\n}<\/pre>\n
and add the following to the end of the configuration file:<\/p>\n
service managesieve-login {\n  inet_listener sieve {\n    port = 4190\n  }\n}\nservice managesieve {\n}\nprotocol sieve {\n    managesieve_max_line_length = 65536\n    managesieve_implementation_string = dovecot\n    log_path = \/var\/log\/dovecot-sieve-errors.log\n    info_log_path = \/var\/log\/dovecot-sieve.log\n}\nplugin {\n    sieve = ~\/dovecot.sieve\n    sieve_global_path = \/etc\/dovecot\/sieve\/default.sieve\n    sieve_dir = ~\/sieve\n    sieve_global_dir = \/etc\/dovecot\/sieve\/global\/\n}\nlda_mailbox_autocreate = yes\nlda_mailbox_autosubscribe = yes\nprotocol lda {\n    mail_plugins = $mail_plugins autocreate sieve quota\n    postmaster_address = postmaster@mydomain.com\n    hostname = mail.mydomain.com\n    auth_socket_path = \/var\/run\/dovecot\/auth-master\n    log_path = \/var\/log\/dovecot-lda-errors.log\n    info_log_path = \/var\/log\/dovecot-lda.log\n}\nprotocol lmtp {\n    mail_plugins = $mail_plugins autocreate sieve quota\n    log_path = \/var\/log\/dovecot-lmtp-errors.log\n    info_log_path = \/var\/log\/dovecot-lmtp.log\n}<\/pre>\n
set-up some necessary stuff<\/p>\n
## touch \/var\/log\/{dovecot-lda-errors.log,dovecot-lda.log}\n## touch \/var\/log\/{dovecot-sieve-errors.log,dovecot-sieve.log}\n## touch \/var\/log\/{dovecot-lmtp-errors.log,dovecot-lmtp.log}\n## mkdir -p \/etc\/dovecot\/sieve\/global\n\n## chown vmail: -R \/etc\/dovecot\/sieve\n## chown vmail:mail \/var\/log\/dovecot-*<\/pre>\n
restart dovecot<\/code> for the changes to take effect<\/p>\n
## service dovecot restart<\/pre>\n
verify manage-sieve<\/strong> is exposed on port 4190<\/code><\/p>\n
## netstat -tunlp | grep :4190<\/pre>\n
\n
SET-UP GLOBAL SPAM FILTERS<\/strong><\/h3>\n
Next step is to actually test the server-side filter by setting up a global SPAM sieve filter rule in \/etc\/dovecot\/sieve\/default.sieve<\/code>. This rule should match all emails marked as SPAM by SpamAssassin<\/strong> and move them to the Spam<\/code> maildir. So, create the following:<\/p>\n
## vim \/etc\/dovecot\/sieve\/default.sieve<\/pre>\n
and add the sieve rules below<\/p>\n
require [\"fileinto\"];\n# rule:[SPAM]\nif header :contains \"X-Spam-Flag\" \"YES\" {\n        fileinto \"Spam\";\n}\n# rule:[SPAM2]\nelsif header :matches \"Subject\" [\"*money*\",\"*Viagra*\",\"Cialis\"] {\n        fileinto \"Spam\";\n}<\/pre>\n
\n
SET-UP POSTFIX DELIVERY<\/strong><\/h3>\n
for this to work we need to edit two Postfix<\/strong> configuration files. Start with editing \/etc\/postfix\/main.cf<\/code><\/p>\n
## vim \/etc\/postfix\/main.cf<\/pre>\n
and change\/add the following<\/p>\n
virtual_transport = dovecot\ndovecot_destination_recipient_limit = 1<\/pre>\n
next open \/etc\/postfix\/master.cf<\/code> and add the following to the end of the file<\/p>\n
dovecot   unix  -       n       n       -       -       pipe\n  flags=DRhu user=vmail:vmail argv=\/usr\/libexec\/dovecot\/deliver -f ${sender} -d ${recipient}<\/pre>\n
restart postfix for the changes to take effect<\/p>\n
## service postfix restart<\/pre>\n
with all that in place, send an email to some email account on the server using the subject below<\/p>\n
XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X<\/pre>\n
the email should be flagged as SPAM by SpamAssassin<\/strong> and moved to the Spam<\/code> maildir by Dovecot LDA<\/strong><\/p>\n
\n
ENABLE SIEVE PLUGIN IN ROUNDCUBE<\/strong><\/h3>\n
to be able to manage server-side filter rules<\/strong> through Roundcube<\/strong>, we need to enable the manage-sieve<\/code> plugin by editing few configuration files.<\/p>\n
change to Roundcube’s document root in \/var\/www\/html\/roundcube\/<\/code><\/p>\n
## cd \/var\/www\/html\/roundcube\/<\/pre>\n
edit Roundcube’s main configuration file and set the following:<\/p>\n
## vim +\/PLUGINS config\/main.inc.php\n...\n$rcmail_config['plugins'] = array('managesieve');<\/pre>\n
next, proceed with changing to \/var\/www\/html\/roundcube\/plugins\/managesieve\/<\/code><\/p>\n
## cd plugins\/managesieve\/<\/pre>\n
copy the default configuration file and set the following:<\/p>\n
## cp config.inc.php.dist config.inc.php\n## vim config.inc.php\n...\n$rcmail_config['managesieve_port'] = 4190;\n...\n$rcmail_config['managesieve_default'] = '\/etc\/dovecot\/sieve\/default.sieve';<\/pre>\n
now you can login to your Roundcube WebMail<\/strong>, navigate to Settings > Filters<\/code> and create new filter sets<\/strong> and\/or filter rules<\/strong>.<\/p>\n
\n
Implementing server-side email filtering<\/strong> to the mailserver set-up with virtual users and domains using Postfix and Dovecot<\/a> adds another great and useful feature. Now you can easily filter and organize your emails.<\/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<\/span>.<\/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 set up server-side email filtering with Dovecot Sieve and … <\/p>\n
Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":2699,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1699,1706,13],"tags":[71,371,334,1152,204,370],"class_list":["post-3025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-centos","category-email-servers","category-tutorials","tag-dovecot","tag-filter","tag-mailserver","tag-rosehosting","tag-roundcube","tag-sieve","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"\nDovecot Sieve and Roundcube on CentOS 6 Setup | RoseHosting<\/title>\n<meta name=\"description\" content=\"This guide explains Dovecot Sieve and Roundcube setup on CentOS 6 for those seeking email filtering solutions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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