What subset would you like? I work on email, a startup in private beta.
The same subset that is used by Discord, and Slack. So mostly blockquotes, code, lists, bold, strikethroughs, and italics come to mind.
Thanks, that's the subset we have been wanting to add, along with links. Markdown support in email clients has been a long time coming.
MUAs that understood ad-hoc formatting with things like asterisks and underscores pre-date the invention of Markdown by more than a decade. They didn't really work well in practice.
I find this surprising - I was a fan of BBcode, but Markdown ruined it for me !