Agreed. I used mutt for all my email for a good six years or so until about 2012. However, all the HTML mail with no plaintext version that I was getting killed

Agreed. I used mutt for all my email for a good six years or so until about 2012. However, all the HTML mail with no plaintext version that I was getting killed it for me. There's .mailcap and dumping the HTML through w3m trickery that I know about now that probably bears revisiting mutt.