diff --git a/config/defaults.inc.php b/config/defaults.inc.php
index ed58b7f0e..9e4ba11bf 100644
--- a/config/defaults.inc.php
+++ b/config/defaults.inc.php
@@ -687,6 +687,8 @@ $config['ldap_public']['Verisign'] = array(
   // DN and password to bind as before searching for bind DN, if anonymous search is not allowed
   'search_bind_dn' => '',
   'search_bind_pw' => '',
+  // Optional map of replacement strings => attributes used when binding for an individual address book
+  'search_bind_attrib' => array(),  // e.g. array('%udc' => 'ou')
   // Default for %dn variable if search doesn't return DN value
   'search_dn_default' => '',
   // Optional authentication identifier to be used as SASL authorization proxy
@@ -768,14 +770,19 @@ $config['ldap_public']['Verisign'] = array(
   // if the groups base_dn is empty, the contact base_dn is used for the groups as well
   // -> in this case, assure that groups and contacts are separated due to the concernig filters! 
   'groups'  => array(
-    'base_dn'        => '',
-    'scope'          => 'sub',       // Search mode: sub|base|list
-    'filter'         => '(objectClass=groupOfNames)',
-    'object_classes' => array("top", "groupOfNames"),
-    'member_attr'    => 'member',   // Name of the member attribute, e.g. uniqueMember
-    'name_attr'      => 'cn',       // Attribute to be used as group name
-    'member_filter'  => '(objectclass=*)',  // Optional filter to use when querying for group members
-    'vlv'            => false,      // Use VLV controls to list groups
+    'base_dn'           => '',
+    'scope'             => 'sub',       // Search mode: sub|base|list
+    'filter'            => '(objectClass=groupOfNames)',
+    'object_classes'    => array('top', 'groupOfNames'),   // Object classes to be assigned to new groups
+    'member_attr'       => 'member',   // Name of the default member attribute, e.g. uniqueMember
+    'name_attr'         => 'cn',       // Attribute to be used as group name
+    'email_attr'        => 'mail',     // Group email address attribute (e.g. for mailing lists)
+    'member_filter'     => '(objectclass=*)',  // Optional filter to use when querying for group members
+    'vlv'               => false,      // Use VLV controls to list groups
+    'class_member_attr' => array(      // Mapping of group object class to member attribute used in these objects
+      'groupofnames'       => 'member',
+      'groupofuniquenames' => 'uniquemember'
+    ),
   ),
   // this configuration replaces the regular groups listing in the directory tree with
   // a hard-coded list of groups, each listing entries with the configured base DN and filter.
diff --git a/program/lib/Roundcube/rcube_ldap.php b/program/lib/Roundcube/rcube_ldap.php
index 64288f973..18319fc9a 100644
--- a/program/lib/Roundcube/rcube_ldap.php
+++ b/program/lib/Roundcube/rcube_ldap.php
@@ -52,7 +52,7 @@ class rcube_ldap extends rcube_addressbook
      *
      * @var array
      */
-    private static $group_types = array(
+    private $group_types = array(
         'group'                   => 'member',
         'groupofnames'            => 'member',
         'kolabgroupofnames'       => 'member',
@@ -94,6 +94,9 @@ class rcube_ldap extends rcube_addressbook
                 $this->prop['groups']['name_attr'] = 'cn';
             if (empty($this->prop['groups']['scope']))
                 $this->prop['groups']['scope'] = 'sub';
+            // extend group objectclass => member attribute mapping
+            if (!empty($this->prop['groups']['class_member_attr']))
+                $this->group_types = array_merge($this->group_types, $this->prop['groups']['class_member_attr']);
 
             // add group name attrib to the list of attributes to be fetched
             $fetch_attributes[] = $this->prop['groups']['name_attr'];
@@ -292,6 +295,14 @@ class rcube_ldap extends rcube_addressbook
                 if ($this->prop['search_base_dn'] && $this->prop['search_filter']
                     && (strstr($bind_dn, '%dn') || strstr($this->base_dn, '%dn') || strstr($this->groups_base_dn, '%dn'))
                 ) {
+                    $search_attribs = array('uid');
+                     if ($search_bind_attrib = (array)$this->prop['search_bind_attrib']) {
+                         foreach ($search_bind_attrib as $r => $attr) {
+                             $search_attribs[] = $attr;
+                             $replaces[$r] = '';
+                         }
+                     }
+
                     $search_bind_dn = strtr($this->prop['search_bind_dn'], $replaces);
                     $search_base_dn = strtr($this->prop['search_base_dn'], $replaces);
                     $search_filter  = strtr($this->prop['search_filter'], $replaces);
@@ -321,10 +332,18 @@ class rcube_ldap extends rcube_addressbook
                             }
                         }
 
-                        $res = $ldap->search($search_base_dn, $search_filter, 'sub', array('uid'));
+                        $res = $ldap->search($search_base_dn, $search_filter, 'sub', $search_attribs);
                         if ($res) {
                             $res->rewind();
                             $replaces['%dn'] = $res->get_dn();
+
+                            // add more replacements from 'search_bind_attrib' config
+                            if ($search_bind_attrib) {
+                                $res = $res->current();
+                                foreach ($search_bind_attrib as $r => $attr) {
+                                    $replaces[$r] = $res[$attr][0];
+                                }
+                            }
                         }
 
                         if ($ldap != $this->ldap) {
@@ -355,6 +374,23 @@ class rcube_ldap extends rcube_addressbook
                 $this->base_dn        = strtr($this->base_dn, $replaces);
                 $this->groups_base_dn = strtr($this->groups_base_dn, $replaces);
 
+                // replace placeholders in filter settings
+                if (!empty($this->prop['filter']))
+                    $this->prop['filter'] = strtr($this->prop['filter'], $replaces);
+                if (!empty($this->prop['groups']['filter']))
+                    $this->prop['groups']['filter'] = strtr($this->prop['groups']['filter'], $replaces);
+                if (!empty($this->prop['groups']['member_filter']))
+                    $this->prop['groups']['member_filter'] = strtr($this->prop['groups']['member_filter'], $replaces);
+
+                if (!empty($this->prop['group_filters'])) {
+                    foreach ($this->prop['group_filters'] as $i => $gf) {
+                        if (!empty($gf['base_dn']))
+                            $this->prop['group_filters'][$i]['base_dn'] = strtr($gf['base_dn'], $replaces);
+                        if (!empty($gf['filter']))
+                            $this->prop['group_filters'][$i]['filter'] = strtr($gf['filter'], $replaces);
+                    }
+                }
+
                 if (empty($bind_user)) {
                     $bind_user = $u;
                 }
@@ -559,9 +595,10 @@ class rcube_ldap extends rcube_addressbook
     /**
      * Get all members of the given group
      *
-     * @param string Group DN
-     * @param array  Group entries (if called recursively)
-     * @return array Accumulated group members
+     * @param string  Group DN
+     * @param boolean Count only
+     * @param array   Group entries (if called recursively)
+     * @return array  Accumulated group members
      */
     function list_group_members($dn, $count = false, $entries = null)
     {
@@ -569,7 +606,7 @@ class rcube_ldap extends rcube_addressbook
 
         // fetch group object
         if (empty($entries)) {
-            $attribs = array('dn','objectClass','member','uniqueMember','memberURL');
+            $attribs = array_merge(array('dn','objectClass','memberURL'), array_values($this->group_types));
             $entries = $this->ldap->read_entries($dn, '(objectClass=*)', $attribs);
             if ($entries === false) {
                 return $group_members;
@@ -581,17 +618,17 @@ class rcube_ldap extends rcube_addressbook
             $attrs = array();
 
             foreach ((array)$entry['objectclass'] as $objectclass) {
-                if (strtolower($objectclass) == 'groupofurls') {
-                    $members       = $this->_list_group_memberurl($dn, $entry, $count);
-                    $group_members = array_merge($group_members, $members);
-                }
-                else if (($member_attr = $this->get_group_member_attr(array($objectclass), ''))
+                if (($member_attr = $this->get_group_member_attr(array($objectclass), ''))
                     && ($member_attr = strtolower($member_attr)) && !in_array($member_attr, $attrs)
                 ) {
                     $members       = $this->_list_group_members($dn, $entry, $member_attr, $count);
                     $group_members = array_merge($group_members, $members);
                     $attrs[]       = $member_attr;
                 }
+                else if (!empty($entry['memberurl'])) {
+                    $members       = $this->_list_group_memberurl($dn, $entry, $count);
+                    $group_members = array_merge($group_members, $members);
+                }
 
                 if ($this->prop['sizelimit'] && count($group_members) > $this->prop['sizelimit']) {
                     break 2;
@@ -608,6 +645,7 @@ class rcube_ldap extends rcube_addressbook
      * @param string Group DN
      * @param array  Group entry
      * @param string Member attribute to use
+     * @param boolean Count only
      * @return array Accumulated group members
      */
     private function _list_group_members($dn, $entry, $attr, $count)
@@ -621,8 +659,7 @@ class rcube_ldap extends rcube_addressbook
 
         // read these attributes for all members
         $attrib = $count ? array('dn','objectClass') : $this->prop['list_attributes'];
-        $attrib[] = 'member';
-        $attrib[] = 'uniqueMember';
+        $attrib = array_merge($attrib, array_values($this->group_types));
         $attrib[] = 'memberURL';
 
         $filter = $this->prop['groups']['member_filter'] ? $this->prop['groups']['member_filter'] : '(objectclass=*)';
@@ -1483,7 +1520,7 @@ class rcube_ldap extends rcube_addressbook
     {
         $classes = array_map('strtolower', (array)$entry['objectclass']);
 
-        return count(array_intersect(array_keys(self::$group_types), $classes)) > 0;
+        return count(array_intersect(array_keys($this->group_types), $classes)) > 0;
     }
 
     /**
@@ -1914,7 +1951,7 @@ class rcube_ldap extends rcube_addressbook
 
         if (!empty($object_classes)) {
             foreach ((array)$object_classes as $oc) {
-                if ($attr = self::$group_types[strtolower($oc)]) {
+                if ($attr = $this->group_types[strtolower($oc)]) {
                     return $attr;
                 }
             }
diff --git a/program/steps/settings/func.inc b/program/steps/settings/func.inc
index 3b599c0e5..38bb09c8d 100644
--- a/program/steps/settings/func.inc
+++ b/program/steps/settings/func.inc
@@ -1260,6 +1260,7 @@ function rcmail_settings_tabs($attrib)
         array('command' => 'preferences', 'type' => 'link', 'label' => 'preferences', 'title' => 'editpreferences'),
         array('command' => 'folders',     'type' => 'link', 'label' => 'folders',     'title' => 'managefolders'),
         array('command' => 'identities',  'type' => 'link', 'label' => 'identities',  'title' => 'manageidentities'),
+        array('command' => 'responses',   'type' => 'link', 'label' => 'responses',  'title' => 'editresponses'),
     );
 
     // get all identites from DB and define list of cols to be displayed