MicroSieve is a freeware USENET spam filter. It has been tested on GNU/Linux and Sun Solaris platforms along with Cyclone and Typhoon news servers. Microbrew MicroSieve was designed to be a high speed spam filter for USENET news. It is faster than other Perl-based filters. Similar to other Microbrew products, MicroSieve is released under the GNU General Public License. Check at microbrew.org/products/usieve/