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Portal sites are often open proxy machines belonging to unknowing home users. An open socks proxy is a security hole used by spammers to hide their originating ip address. Spam can made to appear to come from the socks proxy instead of the actual origin. Since the open proxies are controlled "by proxy" outside recognized channels, they provide effective cover for spammers. A computer that has been implanted with open proxy software is called a zombie and can form part of a botnet used by spammers. A reverse web proxy takes requests from website visitors and relays them to the protected spam website, returning any data it receives from the protected site back to the visitor. To the visitor, the proxy itself appears to be the spam website, and there is no good way to tell that it is actually only a proxy. A botnet is a term usually applied to a group of open proxy computers ("zombies") used for spam transmission and related tasks.
proxy blockers websites
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