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Again, ideal for K-12 schools, the bad words policy allows emails not to be sent or received if certain words are part of the policy. This can be added to as and when needed, but as far as I am aware there is no in-built policy. This can be used against any word or even number sequence, should it be needed. If an email matches one of the words in the policy, it will simply not arrive at its destination.
To read more about this gallery, head on over to the ZDNet iGeneration blog.