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Reference.org
Spam and Open Relay Blocking System
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<p>SORBS ("Spam and Open Relay Blocking System") was a list of e-mail servers suspected of sending or relaying spam (a <a href="/facts/DNSBL/XnKVleKE">DNS Blackhole List</a>). It had been augmented with complementary lists that include various other classes of hosts, allowing for customized email rejection by its users. </p>