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<P><FONT SIZE=+2><B>Microbrew MicroSieve</B></FONT></P>

<p>This product has begun the End of Life(EOL) process.  Please see the <a href="eolnotice.php">EOL Notice</a> for more information. </p>

<P><B>Latest is:</B> 0.7.0 Beta<BR>
<B>Latest Stable is:</B> 0.4.0</P>

<P>Please refer to the <A HREF="/support/usieve">support page</A> for
instructions on installation and further project information. 
</P>
<P><FONT SIZE=+1><B>Overview</B></FONT></P>
<P>
Microbrew MicroSieve is designed to be a high speed spam filter for USENET
news.  After using some other filter programs written in Perl, it was
clear
that there needed to be a faster way to filter spam for today's 
high-bandwidth news systems (greater than 200GB/day), and thus MicroSieve 
was born.  As with all Microbrew products, this software is released under
the <A HREF="http://www.gnu.org/licenses/gpl.html">GNU General Public
License</A>.
</P>
<P><FONT SIZE=+1><B>Platform Availability</B></FONT></P>
<P>
MicroSieve has been tested and is known to work on the following platforms:
<UL>
<LI>Solaris 7 (SPARC) running Cyclone News Server.</LI>
<LI>Solaris 7 (SPARC) running Typhoon News Reader.</LI>
<LI>Linux 2.4.x (i386) running Cyclone News Server.</LI>
</UL>
<P><FONT SIZE=+1><B>Performance</B></FONT></P>
<P>Given the large amount of spam riding around in major USENET news
systems, a spam filter has to be very fast and remain effective.  MicroSieve
has easily achieved 5000 articles per minute while only imposing a 2% - 10% CPU
load on a Sun Ultra Enterprise 2 (one 300MHz CPU) while checking for all of the
following:
<UL>
<LI><B>Large Articles</B> - Rejects articles above a user definable
size.</LI>
<LI><B>Spambots</B> - Removes any articles sent by popular spambots.</LI>
<LI><B>Binaries in Non-binary groups</B> - Only allows binaries to be posted
to binary groups, keeping non-binary groups free of clutter.
<LI><B>Path Header Auto-accept</B> - Allows you to set up auto-accept keyed
on the path header so that you don't have to keep filtering articles you
already filtered on another server.
<LI><B>Path Header Auto-Blackhole</B> - Allows you to set up and auto-reject
based on path-header to block out problem sites.
<LI><B>Duplicate Article History Checking</B> - Allows filtering of
duplicate articles based on a custom data-dependent hashing algorithm.
<LI><B>Maximum Cross Post Limit</B> - Sets a limit on the number of
newsgroups that an article can be posted to.  This is effective since
articles that span many newsgroups tend to be junk anyway.
<LI><B>User Supplied Filters</B> - Allows the administrators of news systems to supply their own filters without having to delve into the code of MicroSieve.
</UL>

<P><FONT SIZE=+1><B>Origins</B></FONT></P>
<P>
The MicroSieve project evolved out of <A
HREF="http://www.exit109.com/~jeremy/news/cleanfeed.html">Jeremy Nixon's 
Cleanfeed project</A> and implements a
useful subset of its functionality.  Although MicroSieve uses many of the same rules that
Cleanfeed employs, it shares no actual code with the Cleanfeed project.
</P>


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