On 8/21 Yahoo mail stopped downloading to my Thunderbird. I have been trying to fix this since it started. I have learned a lot, but nothing I have done has fixed the problem. I went to Yahoo, learned about oauth authorization, & generated their 16 digit one time login password. I deleted all my saved yahoo passwords on TB. I logged out of TB & back in, but did not get a 'login' popup. The little dot in the tab of the Inbox just bounces back & forth incessantly. I finally saw where I had to send an email to get the 'enter password' popup window. The problem is that I instead of that, got a 'sending message' popup window with the processing bar doing its thing and a status of 'Copying message to sent folder'. It's just stuck there. BTW - This only affects my Yahoo account. My gmail account works normally. What have I missed?