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Have you recently changed plans or moved home? Anything else you can tell us? I know this may sound quite obvious, but have you logged into your account online, then gone to the "Manage your email accounts section"?
It could be a Telstra fault (always check here first http://servicestatus.telstra.com/ ) Type in your postcode and see if there is a problem in your area. Otherwise get onto Bigpond tomorrow during business hours on 13POND (137663) and go through the process.