Perhaps the easiest method to incorporate the DCC and Razor systems into your mail architecture is via SpamAssassin. This section covers the SpamAssassin-related configuration settings as they relate to DCC, Vipul’s Razor, and Pyzor. Please note that no privileged class SpamAssassin configuration commands are available with respect to DCC and Razor.
By default, SpamAssassin ships with DCC, Razor, and Pyzor active, if available. As a result, if you want to use the features available with these distributed checksum facilities, you don’t have to do anything because they will be activated automatically if they’re available. If you do need to tweak the default settings, the following sections explain each option.