[aidenn0]

4 there's already a standardized rich text format for emails, called "enriched text" defined originally in rfc 1563 almost exactly 27 years ago, and last updated in rfc 1896 about 25 years ago.

It supports many things that markdown does not (setting font families, sizes, and color for one example), and nobody uses it anymore.

[thayne]

Another point is that markdown is still pretty readable as plain text, whereas html, or "enriched text" are a little harder for humans to read if it isn't specially formatted.

[thayne]

and afaik hardly any email clients support it. and even if yours does, chances are the recipient on the other end uses one that doesn't.

[aidenn0]

Right, so I don't know what inventing a new such format will do to improve things.