This package ships several plugins.  To use a plugin, you need to edit
`/etc/roundcube/config.inc.php' add its name to the $rcmail_config['plugins']
array.

Some plugins have a dedicated configuration file
`/etc/roundcube/plugins/PLUGIN_NAME/config.inc.php' while others need to be
configured directly in `/etc/roundcube/config.inc.php'.

 -- Vincent Bernat <bernat@debian.org>, Sun, 13 Feb 2011 15:50:48 +0100