BT Internet and Yahoo Email Hacked

For anyone who uses btinternet.com or Yahoo email with webmail or email clients such as Outlook Express / Windows Live Mail / Thunderbird etc - it seems that eh email system has been compromised resulting in spam messages sent from accounts to contacts in the address book. More info can be found here:
http://forums.digitalspy.co.uk/showthread.php?t=1803444

and here:
http://community.bt.com/t5/Other-BB-Queries/BT-email-accounts-hacked/m-p/796782

If you find returned messages or people tell you they have received junk from you then check via webmail and change your password. As usual the email provider is not being very good at giving out info about the problem!