01-23-04 10:10 PM
On 4 Dec 2003 07:40:04 -0800, vangelob@in.tum.de (murph) wrote:
quote:
>Sebastian Jaenicke <sjaenick@techfak.uni-bielefeld.de> wrote in message new
s:<slrnbsq2q7.8ko.sjaenick@azathoth.jaenicke.org>...
>thank you for the help
>now everything looks OK
>i have some more questions
>1) Why the spamer use invisible fonts in HTML
So you can't see the words when you open the message.
quote:
>i thought that is from the generator of the email, something like the
>ID of the email .But i saw a spam mail and the words were not without
>sense ?
Many spamkiller programs compare the email in question to a known database o
f
spam emails, and grade the sample email according to if it matches or not.
Spammers know this, and try to make their spam email different enough from t
he
known spam so as to not be caught by this comparison technique. They do this
by
adding random words, phrases, or character sequences to the email, in order
to
change the contents enough to fail the comparison. Since these words would
intefere with the human reader's ability to comprehend the email, spammers t
ry
to hide them from view by imbedding them as html comments, or as invalid htm
l
tags, or as invisible text within the body of the email.
quote:
>2) I want to add some new tests to Spamassassin
>Is it possible and how can i do it ?
>Should i change the /usr/share/spamassassin/ files ?
It is possible. See 'perldoc Mail::SpamAssassin::Conf' for details on the
configuration file options, and make your own tests up as a seperate file in
/usr/share/spamassassin. You also want to read the spamassassin(1) manpage;
it
gives some hints about naming and placement of your local grading file withi
n
the spamassassin file hierarchy.
--
Lew Pitcher
IT Consultant, Enterprise Technology Solutions
Toronto Dominion Bank Financial Group
(Opinions expressed are my own, not my employers')
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