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"Message Size exceeded." Sending from Thunderbird via Yahoo

All of a sudden, for any message, regardless of size (the last one only 13.3 kb), I consistently get the following error message:

"An error occurred while sending mail. The mail server responded: Message Size exceeded. Please check the message and try again."

followed by

"Sending of message failed.
Please verify that your Mail & Newsgroups account settings are correct and try again."

It's very similar to a widespread error about a month ago where one had to go into Thunderbird settings and change something from Upper Case to Lower Case: An immediate error message, and regardless of contents.
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