Sending notification e-mails
It's very common for web applications to send notifications to the users, and e-mails are a cheap and effective channel for delivering. The Notes application could benefit from a notification system as well: early in this chapter, we modified the shrink image function so that it runs in a task queue. Users receive a response immediately, but the actual job is put in a queue and they don't know if and when shrink operations complete successfully.
As we can send e-mail messages from an App Engine application on behalf of the administrators or users with Google Accounts, we send a message to the user as soon as the shrink operation is completed.
We first import the mail package in the main.py module:
from google.appengine.api ...
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