Sending failure BT Yahoo Mail

Previously I have been able to send an email to 90 people. Now I am getting this message and a refusal to send.
Your message was not sent.
Suspicious activity was detected on your account.
I waited some hours and that did not allow me to send. I split the list down to 45 per message. The first batch went but I can not send the second even after several hours.
What is happening? Why the change? How can I send as in the past?

My wife and I are both experiencing exactly this problem (since Tuesday 31/03/15)
I have had messages that BT Yahoo mail has been updated
Has this upset my Outlook settings and if so what is the solution please

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