"Fox Flanders" <[EMAIL PROTECTED]> writes:

> I blame SpamAssassin for these Bayes bypassing tricks.  I had a custom
> Bayes solution working many months before it appeared in SpamAssassin.
> There was none of this bypassing crudola happening until SpamAssassin
> popularized Bayes :)

Well, if everyone stopped using SpamAssassin, it would work better too,
so I blame all users.

Anyway, there are a lot of people using Bayes engines of one sort or
another, they're probably just as high on the radar for spammers as
SpamAssassin.  A few are even being used in major email clients now.
 
> Now I get messages with a spam text/html mime part and the Declaration
> of Independence for a text/plain mime part to fool the Bayes filter.
> It is very effective at maiming my Bayes filter.  Of course I could
> start dropping text/plain mime parts when there is a text/html part
> present.

Well, I heard about this weakness before we even adopted Bayes.  It was
coming, one way or another.

There's one non-Bayesian rule in 2.60 to catch some of these, but we
could probably use more rules to catch tricks like this.

Another thing we could do is check each MIME part separately.

Daniel

-- 
Daniel Quinlan                     anti-spam (SpamAssassin), Linux, and open
http://www.pathname.com/~quinlan/   source consulting (looking for new work)


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