I am using Thunderbird 140.6.0esr (64-bit) desktop on Windows 11. I have multiple email accounts setup, two of which are Yahoo accounts. On 12/21, one of the Yahoo accounts stopped delivering messages to Thunderbird from Yahoo while the other continues to download them. Thunderbird does logon to Yahoo for the account in question and gives me a message that there are no messages to download. When I logon to Yahoo mail through a browser, there is plenty of mail that has been received after 12/21 which should be downloading. Both of the Yahoo accounts are setup exactly the same... POP Mail Server pop.mail.yahoo.com Port 995 SSL / TLS OAuth2 Outgoing server smtp.mail.yahoo.com Port 465 SSL / TLS OAuth2 I removed the password from Thunderbird for the account not delivering mail, re-entered it, restarted Thunderbird and got the same results. I changed the password (through yahoo mail), entered the new password into Thunderbird and got the same results. I also tried restarting Thunderbird again after entering the new password which made no difference. Any help and suggestions would be greatly appreciated. Thanks, Lew