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Applies To: Models 1000, 2000, 3000
The below information was taken from the dcc/dcc-tree/dcc.html>dcc man (as in manual) page:
The Distributed Checksum Clearinghouse or dcc is a cooperative, distributed system intended to detect "bulk" mail or mail sent to many people. It allows individuals receiving a single mail message to determine that many other people have received essentially identical copies of the message and so reject or discard the message.
A dcc server accumulates counts of cryptographically secure checksums of messages but not the messages themselves. It exchanges reports of frequently seen checksums with other servers. dcc clients send reports of checksums related to incoming mail to a nearby dcc server.
Each report from a client includes the number of recipients for the message. A dcc server accumulates the reports and responds to clients the the current total number of recipients for each checksum. The client adds an SMTP header to incoming mail containing the total counts. It then discards or rejects mail that is not "white-listed" and has counts that exceed local thresholds.
