diff -urN plugins.orig/managesieve/config.inc.php.dist plugins/managesieve/config.inc.php.dist
--- plugins.orig/managesieve/config.inc.php.dist	2013-03-27 22:51:27.000000000 +0200
+++ plugins/managesieve/config.inc.php.dist	2013-07-27 16:28:54.000000000 +0300
@@ -1,5 +1,10 @@
 <?php
 
+// PEAR database DSN for read operations with manasieve hosts data
+// format is db_provider://user:password@host/database 
+//$rcmail_config['managesieve_db_dsnw'] = 'mysql://mail:123123123@localhost/mail';
+//$rcmail_config['managesieve_db_query'] = "SELECT host, '4190' AS port FROM passwd WHERE id='%u';";
+
 // managesieve server port
 $rcmail_config['managesieve_port'] = 2000;
 
diff -urN plugins.orig/managesieve/managesieve.php plugins/managesieve/managesieve.php
--- plugins.orig/managesieve/managesieve.php	2013-03-27 22:51:28.000000000 +0200
+++ plugins/managesieve/managesieve.php	2013-07-27 16:29:32.000000000 +0300
@@ -201,9 +201,36 @@
         $include_path .= ini_get('include_path');
         set_include_path($include_path);
 
+        if ($this->rc->config->get('managesieve_db_dsnw') and $this->rc->config->get('managesieve_db_query')) {
+            $managesieve_db = new rcube_mdb2($this->rc->config->get('managesieve_db_dsnw'), '', FALSE);
+            $managesieve_db->db_connect('w');
+
+            $managesieve_db->set_debug((bool) $this->rc->config->get('sql_debug'));
+            $dsn = MDB2::parseDSN($this->rc->config->get('managesieve_db_dsnw'));
+            $managesieve_db->set_debug(true);
+
+            $sql = str_replace('%u', $_SESSION['username'], $this->rc->config->get('managesieve_db_query'));
+
+            $res = $managesieve_db->query($sql);
+            if ($error = $managesieve_db->is_error()) {
+                raise_error(array('code' => 601, 'type' => 'db', 'file' => __FILE__, 'line' => __LINE__,
+                            'message' => "Managesieve plugin: query '$sql' failed. Check DSN and verify that SELECT privileges are granted to user '".$dsn['username']."'. <br/><br/>Error message:  " . $error), true, true);
+            }
+
+            if ($row = $managesieve_db->fetch_assoc($res)) {
+                $host = $row['host'];
+                $port = $row['port'];
+            } else {
+                raise_error(array('code' => 403, 'type' => 'php', 'file' => __FILE__, 'line' => __LINE__,
+                    'message' => "Unable to fetch info about managesieve host and port"), true, true);
+            }
+        } else {
+
         $host = rcube_parse_host($this->rc->config->get('managesieve_host', 'localhost'));
         $port = $this->rc->config->get('managesieve_port', 2000);
 
+        }
+
         $host = rcube_idn_to_ascii($host);
 
         $plugin = $this->rc->plugins->exec_hook('managesieve_connect', array(