Unlike BlackBerry to BlackBerry communication on BES, BIS email messages are not encrypted before they travel over a mobile carrier’s network. For BIS users, only the mobile carrier’s standard 3G/2G protection applies.
RIM states:
Email messages sent between the BlackBerry Internet Service and the BlackBerry Internet Service subscriber’s BlackBerry smartphone are not encrypted. When transmitted over the wireless network, the email messages are subject to the existing or available network security model(s).
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