While we are on this topic...
Has anybody had experience with a decent content filtering application? Not exactly
spam content filters, but more along the lines of policy-based filters...where a
corporation could estabilsh policies for what types of content to allow their
employees to send & receive.
These apps usually describe themselves as "prevents confidential data loss",
"safeguards your organization from embarassment & costly lawsuits".
I would imagine that an application such as this could be integrated with Declude as
an external test. Any ideas?
Bill
-----Original Message-----
From: "R. Scott Perry"
Sent: Wed, 23 Oct 2002 08:22:33 -0400
Subject: Re: [Declude.JunkMail] Recommendation: Symbol Wildcard
forFilters
> > That's something that a number of people have requested, but has two
> > drawbacks: It requires lots of programming time to create, and lots of CPU
> > time.
>
>Hmmm... Not to be a pest, but I'm wondering if this wouldn't actually
>IMPROVE performance?
The problem is that it requires going through the E-mail one character at a
time and running a test against each of the filters. Each of those tests
is much more involved than a string match (which most of the time just
requires comparing 2 bytes).
If all that is being added is a single character that is used to replace a
single character, it wouldn't be so bad. But once you go a step beyond
that -- a single character representing punctuation but not letters, for
example, or "*", or regexp expressions, it can get much more complex quickly.
>RULE "free~" finds "free" "free!" "free." "free?" etc. but not "freedom"
>or "freeze" -- all in one pass. It covers STARTSWITH, CONTAINS, IS and
>ENDSWITH in one shot.
>
>RULE "~sex" finds "sex" "sexy" "sexiest" "sexaholic" "sex!!!" etc. but
>not "Essex" or "unisex" -- all in one pass. Again, operators
>STARTSWITH, CONTAINS, IS and ENDSWITH are all covered. One rule.
True -- it would likely save CPU time over having multiple filter entries.
Again, this is something that we are looking into, but we just haven't made
any final decisions about.
-Scott
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