Markdown is a client feature. We send markdown as text and converted as html. If you look at the API there are just text and html fields http://developer.nvlope

Markdown is a client feature. We send markdown as text and converted as html. If you look at the API there are just text and html fields http://developer.nvlope.com/v1/mail/send/ http://developer.nvlope.com/v1/mail/send/