Sending Messages with Third-Party Services
Node.js applications on App Engine can use third-party companies to send email, SMS messages, or make and receive phone calls. For example, you might send email to confirm business transactions, confirm the creation of user accounts, or send marketing communications. This page lists some examples of companies that provide communication services and client libraries for Node.js applications on App Engine.
https://cloud.google.com/appengine/docs/flexible/nodejs/sending-messages
