Update third_party-roundcube.md: managesieve

The current doc gives "cannot connect to db" in Roundcube 1.4.6, managesieve. The config should be placed in the plugin itself and not in the general config file of Roundcube.

docs/third_party-roundcube.md

@@ -44,7 +44,18 @@ $config['enable_installer'] = true;
 $config['smtp_conn_options'] = array(
   'ssl' => array('verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true)
 );
+$config['db_prefix'] = 'mailcow_rc1';
+```
 
+Point your browser to `https://myserver/rc/installer` and follow the instructions.
+Initialize the database and leave the installer.
+
+**Delete the directory `data/web/rc/installer` after a successful installation!**
+
+### Configure ManageSieve filtering
+
+Open `data/web/rc/plugins/managesieve/config.inc.php` and change the following parameters (or add them at the bottom of that file):
+```
 $config['managesieve_port'] = 4190;
 $config['managesieve_host'] = 'tls://dovecot';
 $config['managesieve_conn_options'] = array(
@@ -55,15 +66,8 @@ $config['managesieve_conn_options'] = array(
 // 1 - add Vacation section,
 // 2 - add Vacation section, but hide Filters section
 $config['managesieve_vacation'] = 1;
-$config['db_prefix'] = 'mailcow_rc1';
-
 ```
 
-Point your browser to `https://myserver/rc/installer` and follow the instructions.
-Initialize the database and leave the installer.
-
-**Delete the directory `data/web/rc/installer` after a successful installation!**
-
 ### Enable change password function in Roundcube
 
 Open `data/web/rc/config/config.inc.php` and enable the password plugin: