Symfony Mailer in Core: The Road Ahead

Drupal Core currently provides a very rudimentary API for sending transactional emails. This applies to both, the way emails are constructed (markup rendered to plaintext) as well as the way they are delivered (using the very limited built-in PHP mail function). A growing number of contrib projects are attempting to close this gap. However, to give site builders the tools they need to make their emails look good and work with modern email infrastructure, contrib projects must apply crude hacks to work around the limitations of the core mail API.