Here is the imported blacklist database on the content filter configuration window. Blacklisting is possible via categories, and you may enable and disable as many categories as you want. The blacklist database is based on the one maintained by Fabrice Prigent at the Universite Toulouse 1 Capitole.
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Usage of email client is configured just like the general computer and browser restrictions were configured.
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Same applies to usage of instant messaging clients.
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Resources: Download Linux Mint 10. Read more about Nanny. Download the blacklist database here.