- $squirrelmail_plugin_hooks['left_main_before']['sent_subfolders']
- = 'sent_subfolders_update_sentfolder';
+// hook isn't in 1.5.x; isn't absolutely necessary to run on the folder list anyway
+// $squirrelmail_plugin_hooks['left_main_before']['sent_subfolders']
+// = 'sent_subfolders_update_sentfolder';