|Also... And a long shot at that... What anti-virus are you using? Recently my brother found that Avast freebie had a glitch; in that it would not let him access his bt.yahhoo email account via M$ Office\Outlook... He made some minor change to a setting in Avast and was then well... That was after a wee trawl with google to see what etc...|
I think Avast was set to check outbound messages/info and the like.. and he was advised to change/disable that settling. Previous to the problem there had been issues - so why quite suddenly?