FIX: Don't send notification email when user isn't allowed to see topic

app/jobs/regular/user_email.rb

@@ -41,6 +41,10 @@ module Jobs
         unless post.present?
           return skip(SkippedEmailLog.reason_types[:user_email_post_not_found])
         end
+
+        if !Guardian.new(user).can_see?(post)
+          return skip(SkippedEmailLog.reason_types[:user_email_access_denied])
+        end
       end
 
       if args[:notification_id].present?

app/models/skipped_email_log.rb

@@ -35,7 +35,8 @@ class SkippedEmailLog < ActiveRecord::Base
       sender_text_part_body_blank: 18,
       sender_body_blank: 19,
       sender_post_deleted: 20,
-      sender_message_to_invalid: 21
+      sender_message_to_invalid: 21,
+      user_email_access_denied: 22
       # you need to add the reason in server.en.yml below the "skipped_email_log" key
       # when you add a new enum value
     )