This module allows you to send emails based on Drupal Commerce events. It uses tokens to include order information in the emails and provides conditions to control when emails are sent.
This module lets you react to various Drupal Commerce events to send emails to customers, administrators, or other interested parties. The emails use token replacement to include order details in their text, and the email sender uses an inline conditions element to govern whether or not the email should be sent for the given order / event.
Sending HTML email
You are free to use HTML in the body of emails configured via this module, but you'll need to pair that with the Symfony Mailer module to properly send HTML email from Drupal. For a tutorial on using this in place of the deprecated Swift Mailer module, please see this tutorial.
No more Drupal 7 support
Per this issue, the Drupal 7 branches of this module are not supported.