diff -urN ../roundcubemail-1.1.2.orig/plugins/managesieve/config.inc.php.dist ./plugins/managesieve/config.inc.php.dist
--- ../roundcubemail-1.1.2.orig/plugins/managesieve/config.inc.php.dist	2015-06-04 08:45:33.000000000 +0300
+++ ./plugins/managesieve/config.inc.php.dist	2015-10-04 19:12:54.000000000 +0300
@@ -43,6 +43,9 @@
 // default contents of filters script (eg. default spam filter)
 $config['managesieve_default'] = '/etc/dovecot/sieve/global';
 
+// prefix contents of root user filters script
+$config['managesieve_user_root_prefix'] = "require [\"include\"];\r\ninclude :global \"personal-spam-quarantine\";\r\n";
+
 // The name of the script which will be used when there's no user script
 $config['managesieve_script_name'] = 'managesieve';
 
diff -urN ../roundcubemail-1.1.2.orig/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php ./plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
--- ../roundcubemail-1.1.2.orig/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php	2015-06-04 08:45:33.000000000 +0300
+++ ./plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php	2015-10-04 19:48:41.000000000 +0300
@@ -2143,6 +2143,7 @@
                     ."#\n"
                     ."# For more information, see http://wiki.kolab.org/KEP:14#USER\n"
                     ."#\n";
+                $content .= $this->rc->config->get('managesieve_user_root_prefix');
                 if ($this->sieve->save_script('USER', $content)) {
                     $_SESSION['managesieve_user_script'] = 'USER';
                     if (empty($this->master_file))