This is a message from the BT Yahoo! Mail server. Usually it's only about a temporary problem. If you see the message, try what you were doing a second time.
If you get the error message again, please check the Service Status 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
If you're having problems with your emails or your're receiving error messages, please use the link below for further information about error messages and how to resolve them: