DCC a distributed anti-spam filter

Distributed Checksum http://www.aliyun.com/zixun/aggregation/16442.html ">clearinghouses (DCC), a distributed calibration and Information Interchange Center, is a anti-spam content filter that runs on a variety of operating systems. It is used by the SMTP server and the Mail user agent to detect, reject, and filter spam, as well as a large number of messages that are unknown. DCC server can exchange common checksum data. A checksum value includes a constant cross public mutation of a large number of messages, including "Personalizations".

The following figure is a recently detected spam message that shows the effectiveness of the system.

DCC server statistics from the client information on the total number of checks of the report, DCC client shows the message to the server validation report, and each validation report clearly shows the total number of mail recipients. If the total is higher than the threshold set by the client and is an unknown local whitelist message, the DCC client records, discards, or rejects the messages.

Download Address: Http://www.rhyolite.com/dcc/source/dcc.tar.Z