[Dshield] Spam Filter for MS Exchange Server
superc at visuallink.com
Wed Jan 21 16:13:36 GMT 2004
Personally, I am opposed to third party filters.
For the paranoid, there is one inherit flaw in using a third party filter
of any kind, much less a mail filter. Simply put, you are authorizing a
third party to screen and silently block (kill) your mail. I had a devil
of a time putting free AVG on one person's PC because this ISP, with which
she had an account uses Postini filtering for most users, and Postini
blocked/trapped the AVG activation code (it also blocked Dshield mail to me
containing virus code extracts before I got them to terminate my Postini).
It is bad enough that your email probably goes through a hundred
different servers. At least most of them probably aren't looking at it.
Now you are contracting with a third party (whose membership and employees
you know nothing about) to look at who writes you and to either approve or
disapprove of the contact. Hopefully there is a published policy on what
conditions a mail must meet to become undeliverable spam. Does it include
buzzwords in content? Things like; p*nis, viagra, HGH, Republican Party,
Democrat, "as seen on TV," Hi, etc. Can you edit the buzzwords? Are there
any blocked buzzwords not shown in your edit screen? Do they content
filter your Internet connection too? Perhaps prevent any connection
between your children and pornagraphy and other "objectionable" sites, like
when Norton's child filter blocked connections to the National Rifle
Association and other sites? Perhaps they keep a log of what they approved
or disapproved which you (or someone else) can view. What's the point of
deleting a sensitive email from your machine, if your filter group keeps a
copy? If their site goes down, do you get your mail anyway? Can you be
isolated by a DOS attack against them? If you have enough technical acumen
to be here on Dshield, then you have enough to setup or find your own
software filter, run on your machine, and under your own direct control.
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