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Essential App Engine: Building High-Performance Java Apps with Google App Engine by Adriaan de Jonge

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Chapter 11: Sending and Receiving E-Mail

This chapter demonstrates how to send and receive e-mail on the Google App Engine. First, it shows how to send a full-featured e-mail with HTML markup and an attachment. Then it shows how an application on the App Engine can receive e-mail and store it. Google offers two APIs to send e-mail: the JavaMail API and a low-level API. While presenting examples, this chapter draws a comparison between both APIs.

An App Engine application can use e-mail for many purposes:

• Notify users when changes are made.

• Store details that are hard to remember in the user’s mailbox.

• Deliver electronic products.

• Authenticate website visitors for low trust levels.

• Reach website visitors after they leave the site.

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