I'm not sure what you mean -- it makes sense to me that if you are paying for an email service, they would continue to charge you as long as you store and access those emails in their server, and they would have to take steps to prevent abuse from people who might try to store too much data. Can you be more specific about what the behavior is? Maybe you could show a good way that another email provider has solved this, and provide a helpful guide as to how they could implement that?