this feature request has no sense, if you want to receive emails sent
from your app, use a domain attached to your app engine using google
apps.
no code magic here, read more about domains, dns, mx
1. Sign in to the Google App Engine admin console.
2. Go to Administration > Versions
3. Click the 'Add Domain...' button under Domain Setup.
4. Enter your domain name in the 'Domain Name:' field
5. Click 'Add Domain'. You will be directed to the Google Apps
administrator console to complete the process.
6. Log in to the Google Apps control panel with your administrator
account.
7. Accept the terms and specify the access URL you'd like to
provide for your application.
8. Click 'Accept'.