I used to read Stack Exchange newsletters in mutt all the time, but now I'm just presented with this:
Date: Thu, 25 Jan 2018 18:01:44 +0000 (UTC) From: Stack Overflow <firstname.lastname@example.org> To: «redacted» Subject: Meta Stack Exchange Newsletter - Thursday, January 25, 2018 ⋮ [-- text/html is unsupported (use 'v' to view this part) --]
instead of the Markdown that it used to show. It appears the newsletters are now HTML-only and omit the plain text alternative. It used to be easy to select the link in Mutt and middle-click it into Firefox. Viewing the HTML as text doesn't really work as an alternative; it is much less readable than the Markdown version, especially with the 9-line-long links!