I’ve been looking for a mail client that lets me compose e-mails using Markdown syntax (I don’t mean copy-paste the generated HTML from elsewhere) and, in particular, insert code snippets with syntax highlighting in my e-mails.
I thought I’d mention it here as a possible future feature.
Hence the liking of the feature request. Markdown would be wonderful, but it would have to be an option because 99% of your clients won’t want it. Furthermore, you’ll then end up with all sorts of requests to improve your markdown editor.