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104 Administrator’s Guide SurfControl RiskFilter - E-mail V5.2.4
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Key Points
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Q With phrase value:
– Increasing the value will increase filtering strength
– Decreasing the value will decrease filtering strength
Q Rather than creating a new dictionary, you can import a ready-made one from elsewhere. There are
two ways in which you can import dictionaries into RiskFilter:
– Import a SurfControl dictionary pack
– Import a unicode text file
Q Importing a unicode text file is an easy way to add large numbers of words and their scores to an
existing dictionary, or create a new one.
Q There are two ways of exporting Dictionaries:
– As a SurfControl Dictionary pack (an XML file)
– As a unicode file
Q The policy module of RiskFilter supports infinite policy recursion, i.e. the global policy can include
multilevel sub-policies.
Q Once you have created a policy, you can edit it or delete it at any time.
Q The supplied filters consist of an Anti-Virus Filter - McAfee, Anti-Spam Filters - Heuristics and
LexiRules, Internet Threat Database Filter, General Content Filter, Advanced Content Filter, Message
Attachment Filter, Content Guardian and Standard Disclaimer filter.
Q Once you have added one of the following filters you will be unable to add another filter of the same
type: Anti-Virus Agent - McAfee, Anti-Spam Agent - DFP, Anti-Spam Agent - Heuristics, Anti-Spam
Agent - LexiRules and Standard Disclaimer.
Q The Anti-Virus Agent filter is supplied with the product and enabled by default, so it will filter messages
automatically without any prior modification.
Q The Internet Threat Database Filter enables you to maximise message filtering by using SurfControl’s
database of 9 Million URLs. This enables you to apply a rule to a group of URLs rather than having to
enter each one individually.
Q A valid keyword expression is composed of keywords and logical operators.
Q Multiple operators can be used in a single keyword expression, but multiple operator types are not
allowed in a single dynamic keyword expression.
Q The filtering criteria of Content Guardian consists of one or more filtering rule(s) which are made up of
three parts: filtering target, matching condition, and filtering content.
Q RiskFilter is pre-configured with the following dictionaries: Adult, Alcohol/Tobacco/Drugs, Arts/
Entertainment, Computing/Internet/hacking, Confidential, Finance, Gambling, Hate speech/Offensive,
Job search, Medical/Healthcare, Shopping, Spam, Spam Misspellings, Sports, Travel and Violence/
Weapons.
Q The Dictionary Threshold filter works by assigning each word a numeric value. It then checks to see
how many words from the selected dictionaries appear within a message and adds up the total. If this
value is greater than the value specified in the Dictionary Threshold filter, the filter will trigger.