Send feedback App Engine Documentation PHP Standard Environment Docs API Documentation \google\appengine\api\mail Classes AdminMessage Allows users to send mail to application admins using the App Engine mail APIs. BaseMessage Abstract base class for sending mail using the App Engine mail APIs. Message Allows users to send mail using the App Engine mail APIs. Was this page helpful? Let us know how we did: Send feedback 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 our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated June 3, 2019.