[James Wiki] Update of "MailetIdeas" by MarcHanlon

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The following page has been changed by MarcHanlon:
http://wiki.apache.org/james/MailetIdeas

The comment on the change is:
DCCIFD is done

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     *  '''IP port spam filter''' - mark messages as spam from certain IP addresses, usually large ranges or heavy senders, or possibly geographic lookups.
     *  '''Blacklists''' - either can be based on IP address or sender.
     *  '''Message signature''' - some systems will hash the message to get a quick "signature" of a spam message, and then block further copies of these.
+      * Done - see DCCIFD, this is the same principle
     *  '''Bayesian filtering''' - probably the most promising spam filtering, this learns what are frequent words that appear in spam and not spam, and then checks the frequency of these words in an incoming message to determine whether it's spam or not.  Quite effective!!
     *  '''Usage Limitations''' - Limit number of messages an authenticated user can send (daily or weekly) - this would keep users on a system from using it for mass-mailings.
     *  '''Pornography Filtering''' -  11/27/2000 CNN.com article describes how a filter checks for attachment images, opens them and counts the percentage of color pallete in the skin tone, and high amounts generally means it's a porn image.