*
* Since 1.4.3 hook supports more than one plugin.
*
+//FIXME: make $subfolders_of_inbox_are_special a configuration setting in conf.pl and config.php
* Since 1.4.22/1.5.2, the administrator can add
* $subfolders_of_inbox_are_special = TRUE;
* to config/config_local.php and all subfolders