Recently some (not all) of my emails are showing what looks like html (but won't translate when I use an html converter). This is the default Windows mail app and yahoo mail account. Any ideas as to a fix?

Looks like this is a wide problem with the windows mail app which is apparently on it's way out:

https://answers.microsoft.com/en-us/windows/forum/all/mail-app-emails-appearing-in-raw-html-data/81700b5a-da59-469e-bc6b-36fd2b516f7d

Thought it was removed from W10🤷