diff --git a/lib/header/filter.js b/lib/header/filter.js
index <HASH>..<HASH> 100644
--- a/lib/header/filter.js
+++ b/lib/header/filter.js
@@ -20,7 +20,7 @@ module.exports = (function() {
    */
   filter.map = {
     address: [ 'from', 'reply_to', 'to', 'cc', 'bcc', 'sender' ],
-    // subject: [ 'subject' ],
+    subject: [ 'subject' ],
     content_type: [ 'content_type' ]
   };
Forgot to uncomment 'subject' in the filter.map