For what it's worth, my password is already all lower case and numbers.
I wouldn't be able to change it anyway if my current password isn't being accepted.
Can you not log onto BTYahoo webmail? If you can then you can change the password from the accounts page. You then change the password in your email client so that it can log into your email account.If you already have them all in lower case and numbers then it might not work but it was only a suggestion to try and help and as you can't get into your email via your email client what have you got to loose by trying.
It's working again now and I didn't do anything apart from eat a bowl of cornflakes.
If anyone else has the problem I suggest they eat a bowl of cornflakes - it worked for me!
It's an intermittent problem that's been ongiong for years, nobody at BT seem able to explain it. It eventually works again, but can happen for up to a day which can be very inconvenient.
Yes, I was aware of the ongoing problem and I guessed you were too, that's why I never mentioned it and suggested the "password change" fix. It looks like there will never be a fix from BT or Yahoo so I think the cornflakes fix is as good as it gets.
I have extra special muesli and have hardly ever had the password problem, so it looks as though the relative healthiness of your breakfast has something to do with it. Does anyone in the US ever manage to connect to their email first time?