I am reading the tutorial about Receiving Mail. I updated the app.yaml file as instructed:
application: hello-1-world
version: 1
runtime: python
api_version: 1
Is help@hello-1-world.appspotmail.com a valid google user? GAE can receive/send mails only from the google user of your application. Your code seems correct.
"Also, why do I need to have a separate script to handle incoming mail? Why can't I put the ReceiveEmail handler in my hw.py" -> the main script is to handle url request, I think is much clearer in this way.