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# The Mail Java API

App Engine applications can send email messages on behalf of the app's administrators, and on behalf of users with Google Accounts. Apps can receive email at various addresses. Apps send messages using the Mail service and receive messages in the form of HTTP requests initiated by App Engine and posted to the app.

This reference describes how to send and receive email in Java apps. It has the following sections:

- Overview
- Using JavaMail to Send Mail
- Receiving Mail
- Low-level API