I wrote a django app, and it was sending email fine. I am now porting it to use it with Google App Engine, but it won't send for some reason. What's going on?
 *settings.py*

```
EMAIL_HOST = 'smtp.gmail.com'
EMAIL_HOST_USER = 'xxxx@gmail.com'
EMAIL_HOST_PASSWORD = 'xxx'
EMAIL_PORT = 587
EMAIL_USE_TLS = True

*views.py*

from google.appengine.api import mail
import webapp2

...

mail.send_mail(to="xxx@gmail.com", sender="test@test.com", subject="test", body="Hello World")

```

Nothing shows up! It's strange