diff --git a/lib/postal/message_inspection.rb b/lib/postal/message_inspection.rb
index ee2d781..f7f560f 100644
--- a/lib/postal/message_inspection.rb
+++ b/lib/postal/message_inspection.rb
@@ -6,7 +6,7 @@ module Postal
   class MessageInspection
 
     SPAM_EXCLUSIONS = {
-      :outgoing => ['NO_RECEIVED', 'NO_RELAYS', 'ALL_TRUSTED', 'FREEMAIL_FORGED_REPLYTO', 'RDNS_DYNAMIC', /^SPF\_/, /^HELO\_/, /DKIM_/, /^RCVD_IN_/],
+      :outgoing => ['NO_RECEIVED', 'NO_RELAYS', 'ALL_TRUSTED', 'FREEMAIL_FORGED_REPLYTO', 'RDNS_DYNAMIC', 'CK_HELO_GENERIC', /^SPF\_/, /^HELO\_/, /DKIM_/, /^RCVD_IN_/],
       :incoming => []
     }