Index: app/models/mail_handler.rb
===================================================================
--- app/models/mail_handler.rb	(revision 14045)
+++ app/models/mail_handler.rb	(working copy)
@@ -73,7 +73,7 @@
 
   cattr_accessor :ignored_emails_headers
   @@ignored_emails_headers = {
-    'X-Auto-Response-Suppress' => 'oof',
+    'X-Auto-Response-Suppress' => /(oof|all)/,
     'Auto-Submitted' => /\Aauto-(replied|generated)/,
     'X-Autoreply' => 'yes'
   }