diff --git a/comment_notify.module b/comment_notify.module
index 072bdb3..53f42d1 100644
--- a/comment_notify.module
+++ b/comment_notify.module
@@ -461,10 +461,12 @@ function _comment_notify_mailalert($comment) {
   }
   $sent_to = array();
 
-  // Send to a subscribed author if they are not the current commenter
+  // Send to a subscribed author if they are not the current commenter.
   $author = user_load($node->uid);
 
-  if (((!empty($author->comment_notify_settings->node_notify) && $author->comment_notify_settings->node_notify == 1) || (comment_notify_variable_registry_get('node_notify_default_mailalert') == 1 && empty($author->comment_notify_settings->node_notify))) && $user->uid != $author->uid && node_access('view', $node, $author)) {
+  // Do they explicitly want this? Or is it default to send to users?
+  // Is the comment author not the node author? Do they have access? Do they have an email (e.g. anonymous)?
+  if (((!empty($author->comment_notify_settings->node_notify) && $author->comment_notify_settings->node_notify == 1) || (comment_notify_variable_registry_get('node_notify_default_mailalert') == 1 && empty($author->comment_notify_settings->node_notify))) && $user->uid != $author->uid && node_access('view', $node, $author) && !empty($author->mail)) {
     // Get the author's language.
     $language = user_preferred_language($author);
     $raw_values = array(