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Open Relay Behavior-modification System (ORBS), created and run by Alan Brown in New Zealand, was one of the first DNS-based Blackhole Lists (DNSBL), a means by which an internet domain may publish a list of IP addresses, in a database which can be easily queried automatically by other computer programs on the Internet. The ORBS list was used to blacklist IP addresses that were open mail relays, third-party mail servers through which spammers can relay their messages and thus attempt to obfuscate the source of the spam.〔(A spam cop goes AWOL ) 2001-06-08〕 ==Controversy== The ORBS list was controversial for a number of reasons. Many people felt that the methods ORBS employed to scan the Internet for open mail servers could be abusive. ORBS used probes to test for open relays without permission, sometimes over and over again. Some claimed that testing of their networks continued even after they asked ORBS to stop, others claimed that relayed spam didn't stop either. In some cases the tests interfered with mail servers, causing delays, especially when those servers were assigned hundreds of IP addresses. Related to the testing regime, which was excessive in the eyes of a number of email administrators, Brown's policy of adding servers he was unable to test to the list, whether or not they were actually open relays, was also a matter of dispute.〔 Another complaint was that open relays that had never sent spam were listed without notice. False listings on ORBS were also alleged, particularly when Brown was engaged in legal or other dispute against the listed party A website was created in 2001 by Brad Baker called (stoporbs.org ), to offer assistance to other mail administrators who had been listed on the ORBS blacklist for reasons other than open relays. Many administrators felt that by listing servers for other than the reasons advertised (open relays), the list was not reliable for the supposed purpose. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Open Relay Behavior-modification System」の詳細全文を読む スポンサード リンク
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