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clapf is an open source email content filter application. It includes a statistical (inverse chi-square) antispam module, and an interface to several anti-virus products, a web ui (including a spam quarantine) written in PHP.

It supports virtual users, URL- and IP-address blacklists, whitelists, LDAP directories, policy groups, minefield and many more.

clapf can be used as an after queue content filter with Postfix (including as an appliance) and Exim or via the maildrop local delivery agent (LDA).

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