Email alias & sub-accounts

Just discovered that you can no longer login under alias account-can only login to primary account due to recent email software changes.  However they changed this softaware, it is also messing up how Safari saves passwords so now it will not remember sub account and primary as two separate accounts.  This is crazy.  Verizon should send out notices when they make changes like this.  They should also change the software that is telling the browser that the primary and sub-account is the same account.