Sending emails to external users using Workflow

I am developing a product for retail store using dynamics CRM 365. I am in a situation where I wish to send emails to external users ( who are customers not licensed users) . Is it possible to send automated emails to external users ( I know we can define the template to be sent)? How can this be done from within the phone to case business process?

Prior to this I have developed workflows in SharePoint, where I used to send emails to licensed users (Not external users.)

Note: I have no experience in CRM Dynamics.