The first step is to install from the Marketplace. Then, you can set up the Email integration by selecting one of the following method: SMTP or SES.
Please refer to the Setup Guide for more details.
In order to apply the automated email in the chatbot, you can apply the "Send Email" action to a node. It will allow you to setup the sender and receiver email address and formulate the content of the email.
Please refer to the here for more details.