A friend has pointed me to aerc , whose marketing is better than
that of than nmh but nowhere near that of Superhuman. One of its poor
marketing choices was to be honest about its mortal origins and to
release the interesting features as reusable scripts , precluding
consumers from finding divinity in its capabilities.
I have consequently already adapted aerc's "html" utility into my nmh
configuration with this line in my mh_profile.