I was using my email as usual earlier on this evening. At about 11pm I went to check my emails and tried to sign in and got the message; 'Sorry, we don't recognise this email address' several times. Anyone else experiencing this? Is it a site fault or something I've done? If it's me, can anyone suggest what I can do to rectify?
A web search shows no current problems with BT's email service. Assuming that you're trying to access your mail via a web browser (rather than via a dedicated standalone email client), try clearing the browser's cache and/or using a different browser.
(If you need instructions for clearing the cache, please tell us which browser you're using).