I received a phone call this morning on the way to work from my wife who said she received an email from my BT Account at 12:30am today at her work email. It had been sent to all my contacts in my BT Yahoo contacts list. At that time last night all my computers were turned off (We had a chinese and an early night

). IN getting to work this morin g my boss also said he received the mail from me together with one of the other guys I have as a contact. Later this morning I received a mail from the other guy saying he had also received a mail from another guy at work who has a BT Account with the same message contents.
Were the BT servers last night compromised and all contact details used by someone to send stupid emails?
Not happy as the only way I know of stopping this is to delete all my contacts so that BT Yahoo no longer hold those details, which I did this morning. Checked my outbox and there were no messages recorded as being sent since 1st November (I use different methods rather than the online mail fro sending messages in most cases).
Can't find any mention of this anywhere.
TLMC