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To resume receiving email messages from this email address validate the password XXXXX "address" in the Blackberry Service. Many thanks login into the service with your ID for BIS you created when you purchased the phone. Once on the BIS email account site, look for the yahoo email adress in question and click on it to open Here are few: Alltel: Black Berry Internet Service AT&T / Cingular: Black Berry Internet Service Nextel / Sprint: https://blackberry.com/html? When I enter my email address and then my password for the Yahoo account the system says "Blank username.