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Showing content from https://cloud.google.com/appengine/docs/legacy/standard/java/mail/receiving-mail-with-mail-api below:

Receiving Email | App Engine standard environment for Java 8

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Email messages are sent to your app as HTTP requests. To process incoming email messages, you must associate email addresses with servlets in your application configuration, and then include the servlet code with your app. The incoming email generates HTTP requests that are passed to the appropriate servlets for handling.

When you create a new application, incoming email is disabled by default. If you don't explicitly enable incoming email messages sent to your app are ignored.

To enable the incoming email service, modify the appengine-web.xml and web.xml configuration files:

Modify appengine-web.xml by adding an inbound-services section that enables the incoming email service:

Email messages are sent to your app as HTTP POST requests using the following URL:

/_ah/mail/<ADDRESS>

where <ADDRESS> is a full email address, including domain name. Note that even if your app is deployed on a custom domain, your app can't receive email sent to addresses in that domain.

Modify web.xml by mapping email URLs to servlets:

In the above snippets, /_ah/mail/* matches all email addressed to the app. Mail servlets run in the currently serving version of your app in App Engine.

If your app uses pattern matching, consider using a filter-based approach based on the following code snippets.

The above concrete handler is registered using the following snippet in web.xml:

Note that security-constraint directives are not possible on filters; security policies on the handler will have to be introduced some other way.

The JavaMail API includes the MimeMessage class which you can use to parse incoming email messages. MimeMessage has a constructor that accepts a java.io.InputStream and a JavaMail session, which can have an empty configuration.

Create a MimeMessage instance like this:

You can then use various methods to parse the message object:

• Call getFrom() to return the sender of the message.
• Call getContentType() to extract the message content type. The getContent() method returns an object that implements the Multipart interface.
• Call getCount() to determine the number of parts
• Call getBodyPart(int index) to return a particular body part.

After you set up your app to handle incoming email, you can use the development server console to simulate incoming email messages. To learn more, including how to start the development server, see The Java Development Server. After you start your application in the local development server, you can access your application by visiting the URL http://localhost:8888/_ah/admin/, replacing the value 8888 with whatever port you are using if you don't use the default port for the local development server.

In the development server, click Inbound Mail on the left side, fill out the form that appears, and click Send Email.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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