Kernell allegedly gained access to Palin's account in September by correctly answering a series of personal security questions.
The new counts are fraud, unlawful electronic transmission of material outside Tennessee and attempts to conceal records to impede an FBI investigation.
An earlier indictment against Kernell was unsealed in October. He pleaded not guilty and was released on several conditions, including staying away from his computer except for school work.
The October indictment said Kernell tapped into the Alaska governor's widely publicized Yahoo! e-mail account, reset the password and was able to read the contents, make screenshots and post his exploits on the Web using the nickname "rubico." The indictment said at least one other person followed a similar path into Palin's account.
Kernell is the son of longtime state Rep. Mike Kernell of Memphis, chairman of Tennessee's House Government Operations Committee.
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