Added x-header.

app/models/channel/email_build.rb

@@ -18,6 +18,9 @@ class Channel::EmailBuild
       attr['Auto-Submitted'] = 'auto-generated'
     end
 
+    attr['X-Powered-BY'] = 'OTRS - Open Ticket Request System (http://otrs.org/)'
+    attr['X-Mailer'] = 'OTRS Mail Service (3.0.12)'
+
     # set headers
     attr.each do |key, v|
       if key.to_s != 'attachments' && key.to_s != 'body'