On Wed, 19 Mar 2008, James wrote:
When training spamassassin with new spam and ham mails does the database need an existing copy of the emails you trained it with in order to work?
You don't *need* to retain the trained messages, but I believe it is a good idea to retrain your training corpus. It allows you to retrain from scratch should you ever need to, and if a message has been mistrained (e.g. learned as spam when it should have been learned as ham) you still have the message available to do the retraining.
Of course, if you train using a large corpus, retaining the messages may present a problem. I personally age the corpus mail folders monthly and compress the old ones.
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