@rohden
The alternative android client #deltalab already has markdown support, too. For the other platforms I think it will still take a while as markdown is currently not a focus point for us. (also there are still some open questions like do we want to send markdown out as html emails?)

@devSJR just desktop for now and it's opt-in. #deltalab (alternative android app by @adbenitez) already has markdown since some time now. Desktop had it already some time ago (from 2019-06-09 until 2019-12-12) but it was removed again because it was buggy.

See https://support.delta.chat/t/markdown-support-in-chat/159 for the whole history/discussion on markdown support.