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Thunderbird fails to send mail through Yahoo --

Since last night, Thunderbird 10.02 fails to send email through Yahoo. It responds with:-
An error occurred while sending mail. The mail server responded: Transaction failed : Cannot send message due to possible abuse; please visit for more information. Please check the message and try again.

Other email clients work properly. Thunderbird works well with other email servers, but not with the yahoo based accounts. It seems that many people are having issues with this today. Yahoo is handling Thunderbird mail differently since Friday night, 9th March, 2012.

Yahoo is slow to respond at the best of times.
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