Ha, nice. I've written a command line mail sending thing that works pretty similarly! But I was thinking more along the lines of sending only the markdown over the wire and mail clients adding support for it.

We could just start doing it too, at the moment text/markdown just shows as an attachment in clients that don't support it (i.e. all of them). So we could dual-send markdown as text/plain and text/markdown and gradually make clients adapt!

That's what I dream about at night anyways.

Edit: letters