Commonmark in emails


The text/markdown content type is specified in RFCs 7763 and 7764. Commonmark is declared as text/markdown; variant=CommonMark.

I was curious whether it could transparently replace text/plain in email communication, but apparently several clients do not fall back gracefully to text/plain although they ought to.

I also tried to find email clients that not only support entering markdown (and convert to HTML), but also announce it somehow in the Content-Type header for the plain text part. The few I found use text/plain; markup=markdown instead.

Should users petition app makers to support either the subtype or the parameter?


Native support in both MUAs and browsers seem like an important goal.