Removing return_path defaulting. (#172)

* removed return_path & added a test for headers defaulting

* Removed deprecated method example

Author: jgzamora

examples/transmissions/get_transmissions.py

@@ -31,8 +31,7 @@ def _translate_keys(self, **kwargs):
         }
 
         model['description'] = kwargs.get('description')
-        model['return_path'] = kwargs.get('return_path',
-                                          '[email protected]')
+        model['return_path'] = kwargs.get('return_path')
         model['campaign_id'] = kwargs.get('campaign')
         model['metadata'] = kwargs.get('metadata')
         model['substitution_data'] = kwargs.get('substitution_data')

sparkpost/transmissions.py

@@ -17,8 +17,8 @@
 def test_translate_keys_with_list():
     t = Transmissions('uri', 'key')
     results = t._translate_keys(recipient_list='test')
-    assert results['return_path'] == '[email protected]'
     assert results['content']['use_draft_template'] is False
+    assert isinstance(results['content']['headers'], dict)
     assert results['recipients'] == {'list_id': 'test'}