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 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.
This session is a very short introduction into core and contrib mail APIs followed by a (hopefully) long Q&A where the audience is encouraged to bring in their PoV regarding the future of transactional email. The results of this session will ideally lead to a clear and broadly accepted plan for the next step on how Drupal core transactional email is going to be modernized in upcoming releases.