Projects / Distributed Checksum Clearinghouse

Distributed Checksum Clearinghouse

Distributed Checksum Clearinghouse (DCC) is a system of clients and servers that collect and count checksums related to mail messages. The counts can be used by SMTP servers and mail user agents to detect and reject bulk mail. DCC servers can exchange common checksums. The checksums include values that are "fuzzy", or constant across common variations in bulk messages.

Operating Systems

Recent releases

  •  16 May 2013 21:52

    Release Notes: This release fixes the default Linux run levels and start-dccifd.

    •  19 Aug 2012 02:44

      Release Notes: This release adds partial support for FreeBSD on ARM processors.

      •  10 Jan 2012 22:53

        Release Notes: This release fixes several modest bugs and updates the copy of the SpamAssassin plugin.

        •  12 Jan 2011 18:21

          Release Notes: Decodes HTML &#xxx character references in URLs. Converts UTF-8 domain names to Punycode before checking DNS blacklists.

          •  31 Jul 2010 02:23

            Release Notes: Support for DNS whitelists. An example using is in the sample homedir/dcc_conf file.


            Project Spotlight


            A Fluent OpenStack client API for Java.


            Project Spotlight

            TurnKey TWiki Appliance

            A TWiki appliance that is easy to use and lightweight.