There are hundreds of anti - spam email programs, available on
the market many are free of charge. The top rated ones include,
POPFile free spam filter, Spamfence free spam filter, and
Spamihilator free spam filter.
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The top ranked anti spam appliance is from Spam Titan. They
offer two anti spam appliances. One for e-mail and one for web
filtering. The have free trials for both and cost between $395 -
$850 yearly.
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There are many places where someone can get a free spam filter.
Websites such as, spamtitan, mcafee, antispam, and spamihilator,
all offer free spam filters.
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Some popular free alternatives to Spam Killer include Spam
Fighter and Mail Washer. Some other alternatives are Spam Fence and
Bull Guard Spam Filter.