Kicking out Web spammers with DNSBL
Read OriginalThe article details the author's experience with spam attacks on their blog and the performance issues caused by a PHP-based spam filter. They developed an Apache 2.x module called mod_defensible that uses DNSBL (DNS-based Blackhole List) servers to block spammers at the web server level with a 403 Forbidden error, significantly reducing server load.
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