Thunderbird updated today, 11-16-23, at 12-58-43 PM, in my main PC (Dell3080) quit working after the update. Now I can’t send messages and I received the last message this morning at 5:49 AM. Thunderbird last updated 6-7-23 in my back-up PC (Dell3070) works fine. Its Thunderbird has received the 6-16-23, 5:49 AM message mentioned above, plus four more, the last one at 7:30 PM. Both Thunderbird programs use the identical “Outgoing Server” settings.