web.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
 Copyright 2015 Google Inc.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <servlet>
    <servlet-name>mail</servlet-name>
    <servlet-class>com.example.appengine.mail.MailServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>mail</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- [START filter_handler] -->
  <filter>
    <filter-name>HandleDiscussionEmail</filter-name>
    <filter-class>com.example.appengine.mail.HandleDiscussionEmail</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>HandleDiscussionEmail</filter-name>
    <url-pattern>/_ah/mail/*</url-pattern>
  </filter-mapping>
  <!-- [END filter_handler] -->

  <!-- Uncomment the following lines to use the basic MailHandlerServet
  instead of the filter. -->
  <!-- [START incoming_mail_servlet]
  <servlet>
    <servlet-name>mailhandler</servlet-name>
    <servlet-class>com.example.appengine.mail.MailHandlerServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>mailhandler</servlet-name>
    <url-pattern>/_ah/mail/*</url-pattern>
  </servlet-mapping>
  <security-constraint>
    <web-resource-collection>
      <web-resource-name>mail</web-resource-name>
      <url-pattern>/_ah/mail/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>admin</role-name>
    </auth-constraint>
  </security-constraint>
  [END incoming_mail_servlet] -->

  <!-- [START bounced_mail_servlet] -->
  <servlet>
    <servlet-name>bouncehandler</servlet-name>
    <servlet-class>com.example.appengine.mail.BounceHandlerServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>bouncehandler</servlet-name>
    <url-pattern>/_ah/bounce</url-pattern>
  </servlet-mapping>
  <security-constraint>
    <web-resource-collection>
      <web-resource-name>bounce</web-resource-name>
      <url-pattern>/_ah/bounce</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>admin</role-name>
    </auth-constraint>
  </security-constraint>
  <!-- [END bounced_mail_servlet] -->
</web-app>