Your mail client is unable to connect to your mail server.
If your connection to the internet is okay, and you can surf the web as normal, you should first 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 >
Or call our broadband service status line on Freephone 0800 169 0199
If there are general problems with the network in your area, this may be preventing you from using our services as normal.
If there are no reported problems with the service status in your area then the most likely cuplrit is the set up of the account details in your email client. You should check that your email settings are correct:
How do I set up BT Email on my computer or mobile device? >
Further information
If you're having other problems with your emails or you're receiving other error messages, please use the link below for further information about error messages and how to resolve them:
Using the error message to help fix a fault in BT Yahoo Mail >