--- mailer.rb.orig	2014-06-22 21:38:49.926354603 +0800
+++ mailer.rb	2014-06-22 22:04:26.554745207 +0800
@@ -39,9 +39,15 @@
     @issue = issue
     @users = to_users + cc_users
     @issue_url = url_for(:controller => 'issues', :action => 'show', :id => issue)
+
+    s = "["
+    s << "#{issue.project.parent.name} - " if defined?(issue.project.parent.name)
+    s << "#{issue.project.name} - "
+    s << "#{issue.tracker.name} ##{issue.id}] "
+    s << issue.subject
     mail :to => to_users.map(&:mail),
       :cc => cc_users.map(&:mail),
-      :subject => "[#{issue.project.name} - #{issue.tracker.name} ##{issue.id}] (#{issue.status.name}) #{issue.subject}"
+      :subject => s
   end
 
   # Notifies users about a new issue
@@ -63,7 +69,10 @@
     message_id journal
     references issue
     @author = journal.user
-    s = "[#{issue.project.name} - #{issue.tracker.name} ##{issue.id}] "
+    s = "["
+    s << "#{issue.project.parent.name} - " if defined?(issue.project.parent.name)
+    s << "#{issue.project.name} - "
+    s << "#{issue.tracker.name} ##{issue.id}] "
     s << "(#{issue.status.name}) " if journal.new_value_for('status_id')
     s << issue.subject
     @issue = issue