--- comment_notify.module	2010-08-18 20:46:32.000000000 +0300
+++ comment_notify-862730-5.patch	2010-08-18 20:52:39.989709826 +0300
@@ -403,7 +403,7 @@ function _comment_notify_mailalert($comm
 
   // Send to a subscribed author if they are not the current commenter
   $author = user_load(array('uid' => $node->uid));
-  if (!empty($author->node_notify_mailalert) && $author->node_notify_mailalert == 1 && $user->uid != $author->uid && node_access('view', $node, $author)) {
+  if (((!empty($author->node_notify_mailalert) && $author->node_notify_mailalert == 1) || (variable_get('node_notify_default_mailalert', 0) == 1 && empty($author->node_notify_mailalert))) && $user->uid != $author->uid && node_access('view', $node, $author)) {
 
     // Get the author's language.
     $language = user_preferred_language($author);