I'm inferring that yahoo changed something. I have a windows 11 laptop I inadvertently left at my daughter's house (2 hours away) on October 28. It was turned off so no changes could have occurred over the past 9 days. I get home and opened my old windows 10 laptop (on October 28) and get the message "Edge: too many requests". I tried to find a solution - changed server configuration, reinstalled Thunderbird, etc. I decided to buy a new laptop, windows 11, clean install of thunderbird, same problem. Wasted a lot more time online trying to determine where the problem was. As a final test, today I made it back to my daughter's and turned on my laptop - same problem. So, something has changed since (on?) October 28 so that I cannot access yahoo on my Thunderbird client, on any of my three laptops. Since there were no changes to my original machines, and I bought a new laptop and installed a clean Thunderbird client, I'm assuming it's a yahoo problem.

Any help from anyone or Thunderbird?

This is a Yahoo problem.

This is the usual fix:

First, generate an app PW - see https://help.yahoo.com/kb/SLN15241.html.

Then go to TB menu > Settings > Privacy & Security > Passwords: - click the 'Saved Passwords' button and edit the Yahoo entry to add your new app PW

- if there is no Yahoo entry, it should be created when you next log in successfully

Next, go to TB menu > Account Settings > Server Settings and set the following: - Server Name: export.imap.mail.yahoo.com - Port: 993 - Connection Security: SSL/TLS - Authentication method: Normal password

On the left column, scroll down and click 'Outgoing Server' and edit the Yahoo entry: - Server Name: smtp.mail.yahoo.com - Port: 465 or 587 - Connection Security: SSL/TLS - Authentication method: Normal password

After that's done, click your Inbox. If you need to enter a PW, enter the app PW you just created.