10 lines
649 B
Text
10 lines
649 B
Text
|
The Distributed Checksum Clearinghouses or DCC is an anti-spam content filter
|
||
|
|
that runs on a variety of operating systems. As of the middle of 2007, it
|
||
|
|
involves millions of users, more than six hundred thousand client computer
|
||
|
|
systems, and more than 250 servers collecting and counting checksums related to
|
||
|
|
more than 300 million mail messages on week days. The counts can be used by
|
||
|
|
SMTP servers and mail user agents to detect and reject or filter spam or
|
||
|
|
unsolicited bulk mail. DCC servers exchange or "flood" common checksums. The
|
||
|
|
checksums include values that are constant across common variations in bulk
|
||
|
|
messages, including "personalizations".
|