The Open Relay Data Base (ORDB) was started in 2001 as a means of combating spam. The database did what its name implies - it listed open relays on the Internet that could be used by spammers to send their stuff. However, the ORDB became increasingly less relevant over time as spammers migrated to using other techniques, most notably botnets, and as work on maintaining the ORDB waned. The ORDB was taken offline in December 2006.
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