These Outlook or Outlook Express error messages occur when your program cannot connect to the mail server for some reason.
If you haven't changed your email settings since the last time you used your email program, don't change your email settings, as the fault is quite likely to be a temporary one. Close your program and try again later.
Meanwhile you may also wish to try checking your email via webmail. Go to www.bt.com and log in securely via the 'Email' link on the BT.com navigation bar.
You'll need your BT Yahoo! username and password to set up your email client or to use webmail. If you've forgotten these, use the link below:
Help with BT usernames and passwords >
You may also wish to check the status of our Internet and email services to check that the problem is not a temporary fault affecting BT's mail servers. To do this you should visit the BT Broadband Service Status page using the link below:
Check online for broadband service problems in your area >
Call our broadband service status line on Freephone 0800 169 0199