I use mutt on Linux. It's been working great for years and years, yet earlier this year it got upgraded and "something" changed.
When I get email where the body of the message is html, and the headers show "Content-Type: text/html", I used to be able to type v to view the parts, and then press Enter and the HTML content would be displayed using $HOME/.mailcap and the text browser of my choice. .mailcap has an entry "text/html; w3m %s; nametemplate=%s.html".
Now, this no longer works and I see the glory of HTML email in all its massive horror. When I press v, it shows there is only one part and it's text/html. I press enter and it displays the raw HTML. How do I get this to show formatted HTML with my text browser again?
On the other hand, if the email contains text/multipart and one is HTML, or the HTML is an attachment, it works fine. It's only when the body of the message is HTML that it no longer works. It's like mutt is ignoring .mailcap when the text/html is body, and not an attachment.