UMBC's solution, which uses check_local, lets you simply add a header. Then you can filter mail with the X-Spam-Envelope header into a separate mailbox which the customer can use as he/she sees fit. Rob Banz's anti-spam at UMBC guide has more information.

Interesting new systems can be found in iFile and other types of Bayesian spam filters. Thanks to Jose Nazario for the tip.

Here's an anti-spam presentation by Serge Wroclawski.

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