notify moderators now goes to the "community" user, that saves our poor mods from a flood of pms

if any staff respond to a pm they are automatically added to the list of recipients and will start
getting email notifications

lib/post_creator.rb

@@ -69,6 +69,7 @@ class PostCreator
       update_topic_stats
       update_user_counts
       publish
+      ensure_in_allowed_users if guardian.is_staff?
       @post.advance_draft_sequence
       @post.save_reply_relationships
     end
@@ -104,6 +105,14 @@ class PostCreator
 
   protected
 
+  def ensure_in_allowed_users
+    return unless @topic.private_message?
+
+    unless @topic.topic_allowed_users.where(user_id: @user.id).exists?
+      @topic.topic_allowed_users.create!(user_id: @user.id)
+    end
+  end
+
   def secure_group_ids(topic)
     @secure_group_ids ||= if topic.category && topic.category.read_restricted?
       topic.category.secure_group_ids