diff --git a/assets/js/src/newsletter_editor/components/content.js b/assets/js/src/newsletter_editor/components/content.js
index a884491f3f..aeb168c312 100644
--- a/assets/js/src/newsletter_editor/components/content.js
+++ b/assets/js/src/newsletter_editor/components/content.js
@@ -11,7 +11,7 @@ define([
   // Does not hold newsletter content nor newsletter styles, those are
   // handled by other components.
   Module.NewsletterModel = SuperModel.extend({
-    stale: ['body', 'created_at', 'deleted_at', 'updated_at'],
+    whitelisted: ['id', 'subject', 'preheader'],
     initialize: function(options) {
       this.on('change', function() {
           App.getChannel().trigger('autoSave');
@@ -19,7 +19,7 @@ define([
     },
     toJSON: function() {
       // Remove stale attributes from resulting JSON object
-      return _.omit(SuperModel.prototype.toJSON.call(this), this.stale);
+      return _.pick(SuperModel.prototype.toJSON.call(this), this.whitelisted);
     },
   });
 
diff --git a/tests/javascript/newsletter_editor/components/content.spec.js b/tests/javascript/newsletter_editor/components/content.spec.js
index 1bd1856794..80cd6da66a 100644
--- a/tests/javascript/newsletter_editor/components/content.spec.js
+++ b/tests/javascript/newsletter_editor/components/content.spec.js
@@ -19,7 +19,7 @@ define([
               data2: 'data2Value',
             },
           },
-          someField: 'someValue'
+          subject: 'my test subject'
         });
       });
 
@@ -28,13 +28,32 @@ define([
         global.stubChannel(EditorApplication, {
           trigger: mock,
         });
-        model.set('someField', 'anotherValue');
+        model.set('subject', 'another test subject');
         mock.verify();
       });
 
-      it('does not include styles and content attributes in its JSON', function() {
+      it('does not include styles and content properties in its JSON', function() {
         var json = model.toJSON();
-        expect(json).to.deep.equal({someField: 'someValue'});
+        expect(json).to.deep.equal({subject: 'my test subject'});
+      });
+
+      describe('toJSON()', function() {
+        it('will only contain properties modifyable by the editor', function() {
+          var model = new (ContentComponent.NewsletterModel)({
+            id: 19,
+            subject: 'some subject',
+            preheader: 'some preheader',
+            segments: [1, 2, 3],
+            modified_at: '2000-01-01 12:01:02',
+            someField: 'someValue'
+          });
+
+          var json = model.toJSON();
+          expect(json.id).to.equal(19);
+          expect(json.subject).to.equal('some subject');
+          expect(json.preheader).to.equal('some preheader');
+          expect(json).to.not.include.keys('segments', 'modified_at', 'someField');
+        })
       });
     });