malicious websites for instance, or on principle, to facilitate freedom of speech. Groups of IRC and electronic mail operators run DNSBLs publishing lists of the IP addresses of known open proxies, such as AHBL, CBL, NJABL, and SORBS. The ethics of automatically testing clients for open proxies are controversial. Some experts, such as Vernon Schryver, consider such testing to be "very bad form". Others consider the client to have solicited the
scan by connecting
scan by connecting to a server whose terms of service include testing. See alsoOpen mail relay Open proxies blocked on Wikipedia References1.^ "Accidental spamming, zombies and spoofing". Australian Communications and Media Authority. Retrieved 2008-08-03. [dead link] 2.^ "Blitzed Open Proxy Monitor". Blitzed.org. 2011-08-21. Retrieved June 21, 2014. 3.^ "proxycheck: Open Proxy checker". Corpit.ru. Retrieved 2011-11-21. 4.^ "localhost listed by njabl ?? - news.admin.net-abuse.email | Google Groups".