Are you talking about not being able to login to your webclient site and being able to view you BB email from there? If so, this is true. It is one of the Fantistic New Capabilities for managing email accounts from your Handheld with BIS 2.0. You can, somehow, not sure of the URL, login and add, change, or delete additional email accounts that you will be able to read your email on your handheld, and to respond to with a spoofed address from that account.
Hope This Helps.