Can't Access BT email with Safari

I can't access my BT email account using Safari. I can access all other websites without a problem. Email account worked six hours ago, but not now.

When I attempt to access the account it comes up with various statements saying "Email account has been de-activated" and "Email account has been barred as rules have been breached" and a few others.

I can access my account using Firefox, and I've contacted BT who say there isn't a problem with the account as it can be accessed via Firefox.

I've tried resetting Safari and deleting all cookies, but all to no avail.

Any help would be appreciated.

Ben.