Google App Engine w/ Django - InboundMailHandler appears to only work once

I'm writing an app for Google App Engine (with Python and Django) that needs to receive email and add some elements of the received email messages to a datastore. I am a very novice programmer.

The problem is that the script I specify to handle incoming email appears to only run once (until the script is touched).

Sending a test email from the local admin console to, say, 'test@downloadtogo.appspotmail.com' causes an entity to be added to the local datastore correctly.

Sending a second, third, etc. test email has no effect - the entity is not added.

'Touching' handle_incoming_email.py (which I understand to mean adding or deleting a space and then saving), then sending another test email, will cause the entity to be added correctly.

app.yaml:

application: downloadtogo
version: 1
runtime: python
api_version: 1

handlers:
- url: /static
  static_dir: static

- url: /.*
  script: main.py

- url: /_ah/mail/.+
  script: handle_incoming_emaril.py
  login: admin

inbound_services:
- mail

handle_incoming_email.py:

from downloadtogo.models import Email

import logging, email
import wsgiref.handlers
import exceptions

from google.appengine.api import mail
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext.webapp.mail_handlers import InboundMailHandler

class MailHandler(InboundMailHandler):
  def receive(self, message):
    email = Email()
    email.from_address = message.sender
    email.put()

def main(): 
    application = webapp.WSGIApplication([MailHandler.mapping()], debug=True)
    wsgiref.handlers.CGIHandler().run(application)

main()

models.py:

from appengine_django.models import BaseModel
from google.appengine.ext import db

class Email(db.Model):
  from_address = db.StringProperty()
  to_address = db.StringProperty()开发者_开发问答
  body = db.StringProperty(multiline=True)
  added_on = db.DateTimeProperty(auto_now_add=True)

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Handlers are matched in order. .* matches any request, so the email handler will never match at all. Put .* last.