
Pollustop Spam Filter

The INSTALL files describes most aspects of PolluStop, and explains how to
install it.

Without a license file, PolluStop will only scan the five first messages given
to it. 60-days "unlimited" free trial licenses are available on demand. Please
send an e-mail to info@niversoft.com to request yours.

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PolluStop runs as an external filter in Communigate Pro Messaging Server, by
Stalker Software inc.

Pollustop is first a bayesian-type spam discriminator. PolluStop doesn't reject
mails, PolluStop only tries to determine if an e-mail is a good one, or if it's
a spam, then gives its diagnostic to the user. The user - the system
administrator or the final consumer - can use this diagnostic in filtering
rules to direct the e-mail in a special "Junk mail" mailbox, or simply reject
it.

PolluStop also uses a small set of rules and algorithms to add an additional
level of filtering. It contains protection agains <!-HTML Comments--> attacks,
so mails containing text such as

   <!a>W<!b>e<!c>l<!d>c<!e>o<!f>m<!g>e<!h> <!i>h<!j>e<!k>r<!l>e<!m>!

will be read as "Welcome here!" by the filter. HTML comments are counted, but
their contents is ignored. It also contains other protection systems, such as
one against scrambled-words emails, mails containing sentences like

   Odrer yuor Uinvrestiy Dilpoma Now!

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When trained properly, PolluStop has been proven to reach levels of spam
detection of 98% with no false positive. This is not a warranty, results
may vary. The test conditions were a database of about 8000 messages (4000 spam,
4000 good) on two accounts over a period of two months.

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PolluStop comes with a spam database trained from about 8000 UCE e-mails
received over the last three years. You can choose to use it or use your
own spam corpus to train the database.

THIS PACKAGE CAN'T BE USED AS IS! IT MUST BE CONFIGURED AND TRAINED BEFORE
USE. IF NOT TRAINED, ALL INCOMING EMAILS WILL LIKELY BE TAGGED AS SPAM!

Warning: PolluStop IS NOT YET compatible with cluster installations of
Communigate Pro. Work has to be done, and the licensing scheme will be
different for clusters.

For more information please contact Niversoft at info@niversoft.com
