Setup Yahoo! mail account as POP

It's never required it before, and I know it's not required on High Sierra. It's possible that it's required on Mojave, Catalina, or higher, but I'm not using any of those. And it's never been asked for, either.

But I have nothing that uses iOS, and the only time I ever check their web interface is if I think I got something and it went to Spam when it shouldn't have. But even that doesn't work right, since I can't select individual messages or groups of messages and move or delete them. Yahoo! claims it's my version of macOS because they don't support, but that can't be true, since it worked perfectly fine before mid-July of last year, and it works perfectly fine if I use my VMware virtual Windows 7 system.

Even their web pages don't look right anymore: they're all text and no graphics, like the Internet looked back in the Ancient Times of Netscape.

Safe Boot has no effect; nothing changes. I've never been asked to create or use an App password for Yahoo! Mail; I can login and view messages without any problem. What I can't do is select individual or groups of messages in their webmail client to move or delete — but I can do that if I go through my Windows 7 VM, which also isn't supported anymore by Yahoo! and I've never been asked for an App password there, either.

But since I can get my mail using POP with Thunderbird, this looks like an issue with Mail, not macOS.

I can connect without any problem to Yahoo! Mail; I just can't get my messages as POP unless I use Thunderbird. But I used to be able to get them via POP before July of 2021 and then it and all of Yahoo!'s web sites stopped rendering content correctly (see attached screen shot):

Yes, that is interesting, since before now Brave showed the exact same thing as the screen shot of Safari, which was the same in Firefox. But the fact that it works perfectly fine on Windows 7 VM (which Yahoo! doesn't support anymore), seems to suggest that they're targeting Mac browsers below a certain version, even when there's no new feature from those newer browsers that's being used by their sites.

And it still doesn't explain or solve the problem of not being able to access Yahoo! Mail via POP with Mail.app.

Mail still doesn't connect for a POP account; only IMAP; and Safari still shows the same text-only web pages as Firefox and the other Mac browsers I've tested (except for Brave today).

I'm running AVG Antivirus (the free version), but no VPN or cleaning applications.