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Originally Posted by Klug  The idea is to train a "clean" amavisd with both the "SPAM Archive" and some french spams (collected from several of my own mailboxes) to be able to deploy them by customers setups. |
Training with spam is a good policy. However, spammers are changing the way to send spam. At this moment, you will receive a lot of spam containing images. Training is not useful for this spam, since bayesian filters cannot be trained with images. There is a plugin for "OCRing" images, but it's very CPU intensive.
I suggest to implement a greylist based system. It's really IMPRESSIVE how spam will decrease. There is a SQLGrey tutorial at wiki. I've not tested with SQLGrey because our perimeter mail servers uses postfix-gld service, but it's the same thing.