Your Orange username is also your account name. You have probably set up a new dial-up account in order to get the new e-mail address. You will in theory have to dial-in at least very 90 days in order to keep it activated. There has been a spate of bad publicity (see a number of other threads) about Orange deleting unused accounts without warning and they may be more flexible.
There have been other threads about the amount of Spam using Orange. It is becoming a pain and I am seriously considering moving from them having been a customer since the old Freeserve days.