On Sun, 2019-11-17 at 21:51 -0500, Bob Goodwin wrote:
I communicate with others during the day via text messaging via Thunderbird. I simply address them with 'phonenumber@vzwpix.com and they respond using my fastmail.us email address, this is an essential feature and we have been doing it routinely for several years, it worked perfectly until Fedora-31. Now the message is received but the message itself is not displayed. I can double click on the line at the bottom that shows a .txt attachment and it will offer the option of viewing it in mousepad, a really crude method that adds extra steps.
That sounds more like a change in how they were sent. Though you could look for options like display as plain text. Or the opposite, if they're being sent as HTML.
If the texts are being sent as attachments, rather than being the message content, I think you're going to be stuck with this problem. Most mail clients do not show attachments directly, though some can have a click to view option for some kinds of attachments. A sender can suggest to automatically show the attachment, but that depends on the sender doing it, and your client supporting it, and it being the kind of data that the client can display by itself.