Index: app/models/mailer.rb
===================================================================
--- app/models/mailer.rb	(revision 16430)
+++ app/models/mailer.rb	(working copy)
@@ -93,11 +93,13 @@
     issue = journal.journalized.reload
     to = journal.notified_users
     cc = journal.notified_watchers - to
+    users3 = []
     journal.each_notification(to + cc) do |users|
       issue.each_notification(users) do |users2|
-        Mailer.issue_edit(journal, to & users2, cc & users2).deliver
+        users3 |= users2
       end
     end
+    Mailer.issue_edit(journal, to & users3, cc & users3).deliver if users3.any?
   end
 
   def reminder(user, issues, days)