You can find more information on how to send HTML emails with Symfony mailer on Sending HTML emails with Symfony mailer.
The Drupal.org documentation handbook has a great article for working with email in a development and testing environment: https://www.drupal.org/docs/develop/local-server-setup/managing-mail-handling-for-development-or-testing
The Drupal Commerce team recommends using Mailhog for local email testing and development. DrupalVM will send emails to it by default and it is easily installed locally or through a Docker container.
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