It can not be fixed today. Your account is temporary blocked for sending emails within a 24 hours period. But you can still receive and view your mails.
Yahoo
Mail may have detected an unusual activity on your mail account, the reason why they block your sending option.
Your account will work again after 24 hours. You just have to wait.
But, you may find your luck if you report this issue to the Customer Care of Yahoo Mail as fast as it can be. From this
link
http://help.yahoo.com/l/us/yahoo/mail/postmaster/abuse_smtp.html Fill up completely the Yahoo Help Form.
And click Submit button. In a few time your account will be able to send messages again.
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