So I am answering my own question. I lust saw a message on Talk Talk Service Centre
Onetel Mailzone and Pipex issues
1 hour ago
We're aware of some customers who are unable to login to their Onetel email address, they will see the error message A Fatal Error Has Occurred.Reports are also coming in that customers using Pipex are unable to send and receive emails.
Latest Update 10:20 am 15th November -Our engineers are investigating this as a priority and we will provide updates here. We would like to apologise for any inconvenience this may be causing.