dcc: dcc (Distributed Checksum Clearinghouses) dcc: dcc: The Distributed Checksum Clearinghouses or DCC is an anti-spam content dcc: filter that runs on a variety of operating systems. The counts can be dcc: used by SMTP servers and mail user agents to detect and reject or dcc: filter spam or unsolicited bulk mail. DCC servers exchange or "flood" dcc: common checksums. The checksums include values that are contant dcc: accross common variations in bulk messages, including dcc: "personalizations". dcc: dcc: Homepage: http://www.rhyolite.com/dcc/