Bayes_00 pain

Hi,

Hopefully someone can help me out with a spam issue I have.
It is not as
much a maia problem, but a more generic spam filter issue,
so sorry if I
abuse this list for that...

I am using Maia 1.0.1 for a while now and it holds most of
the spam I
receive. Though, currently there is one type of mail that is
structurally
getting through, while others seem to be stopped correctly..

When looking at the mail headers (check
http
://www.hoekstra.nu/~robert/spam/headers.html) I see it
is being
scanned and notified that it is in the Spamcop Blacklist.
Though, somehow,
the message is hitting 'BAYES_00' too, rendering it under
the radar for
being spam.

I don't know how this has happened and how I can resolve
this issue. How
can a spam message hit BAYES_00 so easily? I learn my spam
filter only
through maia and tell it what spam is and what ham is quite
tightly. Is
this simply a matter of spamassassin having to embrace a new
spamming
technique?? is this likely a setup error on my side?

For the message body: http://
www.hoekstra.nu/~robert/spam/body.html for
referral.

Any advice is appreciated.

-- 
Thanks in advance,

Robert Hoekstra

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Robert Hoekstra wrote:

> I don't know how this has happened and how I can
resolve this issue. How
> can a spam message hit BAYES_00 so easily?
> 
> For the message body: http://
www.hoekstra.nu/~robert/spam/body.html for
> referral.

Welcome to the new world of image-spam.  This relatively new
breed of
spam usually consists of an image that contains all of the
spammy text,
while the text in the rest of the message is taken from
non-spammy
sources, perhaps copied from literature or as
randomly-selected words
from a dictionary.  Since none of the words are particularly
spammy, the
Bayes doesn't see anything objectionable, so you end up
with Bayes
confidence levels at 50% or below.

The best weapon we've currently got against image-spam is
OCR
technology.  There are instructions in our wiki at
<
https://secure.renaissoft.com/maia/wiki/FuzzyOCR>
that explain how to
install a plugin for SpamAssassin that tries to read the
text contents
of these images.  I've been using it for several weeks now
and it's been
working quite well here.

-- 
Robert LeBlanc <rjlrenaissoft.com>
Renaissoft, Inc.
Maia Mailguard <http://www.maiamail
guard.com/>

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