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The Mail Abuse Prevention System (MAPS) is an organisation that provides anti-spam support by maintaining a DNSBL. They provide five black lists, categorising why an address or an IP block is listed: * Real-time Blackhole List (RBL), the one for which MAPS is probably best known. * Dialup Users List (DUL), blocks of addresses that include many SOHO users. * Relay Spam Stopper (RSS), spam relays, e.g. ''hijacked'' servers. * Open Proxy Servers (OPS), naively open SMTP servers. * Non-confirming Mailing List (NML), marketers who use opt-out strategy. The acronym MAPS is spam spelled backwards. ==History== MAPS was founded in 1996 as a non-profit organization to pioneer innovative anti-spam techniques (e-mail). The early history of MAPS is the History of DNSBLs itself. Dave Rand and Paul Vixie, well known Internet software engineers, started keeping a list of IP addresses that had sent them spam or engaged in other behavior that they found objectionable. The list became known as the ''Real-time Blackhole List'' (RBL). Many network managers wanted to use the RBL to block unwanted e-mail. Thus, Rand and Vixie created a DNS-based distribution scheme that quickly became popular.〔RFC 5782〕 Sure that there was an absolute right to publish an anti-spam blacklist, MAPS published a ("How to Sue Us" page ), inviting spammers to sue them and help them create case law. In 2000 MAPS was the named defendant in no fewer than three lawsuits, being sued by (Yesmail ), (Media3 ), and survey giant (Harris Interactive ). As the first lawsuits came in, MAPS brought in Anne P. Mitchell as their Director of Legal and Public Affairs. In 2001 the company started to require a subscription for accessing their lists. Non-subscribed users received a dummy ''unlisted'' response. MAPS explained that their expectation to get enough funds from free support failed, forcing them to make that decision. However, the spirit of the company remained that of a non-profit organization. Their subscription page was quite hidden in their ''.org'' web site, and their fax-based subscription mechanism was rather awkward. In 2004 MAPS became a division of Kelkea, Inc. They moved from Redwood City to San Jose, and from ''.org'' to ''.com''. Dave Rand was the founder and CEO of Kelkea at the time. In June 2005, Trend Micro, Inc. acquired Kelkea. That brought substantial improvement to the subscription mechanism, including a fully automated method for getting temporary subscriptions. In addition, subscribers are provided with personalised web pages where they can view reports and also set up whitelisting and blacklisting options. Whitelisting is particularly convenient, as it allows to whitelist thousands of IP addresses with a few clicks. 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「Mail Abuse Prevention System」の詳細全文を読む スポンサード リンク
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