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.
License: Free for non-commercial use
Changes:
Deal with thrashing problems with large mmap()spaces in recent Linux kernels. Lines in log filesfor DNSBL hits were changed to include the IPaddress from the DNSBL. A DNSBL is probed onlyonce for several -B results with distinct SMTP 4yzor 5yz rejection messages.
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02-20-2008
