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I have heard elsewhere that Bulldog can be great, if it's all working well, but their support can suck, big time.
Most ISPs will require you to have an email account as part of their package. It's their means of sending you messages about your account. No doubt though bulldog's system is set to only accept an @bulldog type address, rather than anything else you input. Outlook Express and other email client's can accept multiple email accounts (I've got about 10 running in mine), set it to auto connect and then ignore, you don't need to use it, just get the messages.
The biggest problem here is the password issues. Only Bulldog will be able to sort that and without that you are going to go round and round in circles. Good luck.