Mutt and Gmail
medium.com
medium.com
lynx?
But using mailcap + some terminal browser should work in general. w3m, lynx, or browsh should work.
For example: http://jasonwryan.com/blog/2012/05/12/mutt/
Even a normal browser will work:
text/html; firefox -remote 'openURL(%s)'A markdown converter could also do the job depending on what you need.