> I saw a blog post about an mu4e plugin that would allow you to write your email in markdown, and it will htmlify it for you.

Perhaps this?

https://www.reddit.com/r/emacs/comments/g6ujzs/sending_richt...

Would be wonderful if this was incorporated into mu4e.

As for html2text, there's also the Python-based html2markdown, which I prefer.

mu4e-html2text-command "html2markdown | grep -v '&nbsp_place_holder;'"