diff --git a/plugins/kolab_delegation/config.inc.php.dist b/plugins/kolab_delegation/config.inc.php.dist
index 879fd476..4eb255de 100644
--- a/plugins/kolab_delegation/config.inc.php.dist
+++ b/plugins/kolab_delegation/config.inc.php.dist
@@ -1,5 +1,21 @@
 <?php
 
+// The id of the LDAP address book (which refers to the $rcmail_config['ldap_public'])
+// or complete addressbook definition array.
+// --------------------------------------------------------------------
+// Note: Multi-domain (hosted) installations can resolve domain aliases
+//   by adding following settings in kolab_auth_addressbook spec.:
+//
+//   'domain_base_dn'   => 'cn=kolab,cn=config',
+//   'domain_filter'    => '(&(objectclass=domainrelatedobject)(associateddomain=%s))',
+//   'domain_name_attr' => 'associateddomain',
+//
+//   With this %dc variable in base_dn and groups/base_dn will be
+//   replaced with DN string of resolved domain
+//---------------------------------------------------------------------
+// When empty, defaults to kolab_auth_addressbook.
+$config['kolab_delegation_addressbook'] = '';
+
 // This will overwrite defined LDAP filter
 // Note: LDAP addressbook defined for kolab_auth plugin is used
 $config['kolab_delegation_filter'] = '(|(objectClass=kolabInetOrgPerson)(&(objectclass=kolabsharedfolder)(kolabFolderType=mail)))';
@@ -9,6 +25,19 @@ $config['kolab_delegation_filter'] = '(|(objectClass=kolabInetOrgPerson)(&(objec
 // Note: LDAP addressbook defined for kolab_auth plugin is used
 $config['kolab_delegation_delegate_field'] = 'kolabDelegate';
 
+// User authentication ID field (from fieldmap configuration)
+// See kolab_auth plugin config
+$config['kolab_delegation_login_field'] = 'email';
+
+// Use this fields (from fieldmap configuration) for identities
+// If the value array contains more than one field, first non-empty will be used
+// Note: These are not LDAP attributes, but field names in config
+// Note: If there are more than one email address, as many identities will be created
+// See kolab_auth plugin config
+$config['kolab_delegation_name_field']         = array('name', 'cn');
+$config['kolab_delegation_email_field']        = array('email');
+$config['kolab_delegation_organization_field'] = array('organization');
+
 // Remove all user identities which do not match the user's primary or alias
 // addresses and delegator's addresses
 $config['kolab_delegation_purge_identities'] = false;
diff --git a/plugins/kolab_delegation/kolab_delegation_engine.php b/plugins/kolab_delegation/kolab_delegation_engine.php
index 8fc0a43a..d548f242 100644
--- a/plugins/kolab_delegation/kolab_delegation_engine.php
+++ b/plugins/kolab_delegation/kolab_delegation_engine.php
@@ -28,6 +28,7 @@ class kolab_delegation_engine
     public $context;
 
     private $rc;
+    private $ldap;
     private $ldap_filter;
     private $ldap_delegate_field;
     private $ldap_login_field;
@@ -225,7 +226,29 @@ class kolab_delegation_engine
      */
     private function ldap()
     {
-        $ldap = kolab_auth::ldap();
+        if ($this->ldap !== null) {
+            return $this->ldap;
+        }
+
+        if ($addressbook = $this->rc->config->get('kolab_delegation_addressbook')) {
+            if (!is_array($addressbook)) {
+                $ldap_config = (array) $this->rc->config->get('ldap_public');
+                $addressbook = $ldap_config[$addressbook];
+            }
+
+            if (!empty($addressbook)) {
+                require_once __DIR__ . '/../kolab_auth/kolab_auth_ldap.php';
+
+                $ldap = new kolab_auth_ldap($addressbook);
+            }
+        }
+
+        // Fallback to kolab_auth plugin's addressbook
+        if (!$ldap) {
+            $ldap = kolab_auth::ldap();
+        }
+
+        $this->ldap = $ldap;
 
         if (!$ldap || !$ldap->ready) {
             return null;
@@ -239,13 +262,13 @@ class kolab_delegation_engine
         $this->ldap_dn = $_SESSION['kolab_dn'];
 
         // Name of the LDAP field with authentication ID
-        $this->ldap_login_field = $this->rc->config->get('kolab_auth_login');
+        $this->ldap_login_field = $this->rc->config->get('kolab_delegation_login_field', $this->rc->config->get('kolab_auth_login'));
         // Name of the LDAP field with user name used for identities
-        $this->ldap_name_field = $this->rc->config->get('kolab_auth_name');
+        $this->ldap_name_field = $this->rc->config->get('kolab_delegation_name_field', $this->rc->config->get('kolab_auth_name'));
         // Name of the LDAP field with email addresses used for identities
-        $this->ldap_email_field = $this->rc->config->get('kolab_auth_email');
+        $this->ldap_email_field = $this->rc->config->get('kolab_delegation_email_field', $this->rc->config->get('kolab_auth_email'));
         // Name of the LDAP field with organization name for identities
-        $this->ldap_org_field = $this->rc->config->get('kolab_auth_organization');
+        $this->ldap_org_field = $this->rc->config->get('kolab_delegation_organization_field', $this->rc->config->get('kolab_auth_organization'));
 
         $ldap->set_filter($this->ldap_filter);
         $ldap->extend_fieldmap(array($this->ldap_delegate_field => $this->ldap_delegate_field));