linux-kernel - Re: bogofilter ate 3/5

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Date:	Thu, 7 Sep 2006 08:46:56 -0500 (CDT)
From:	Chase Venters <chase.venters@...entec.com>
To:	Krzysztof Halasa <khc@...waw.pl>
cc:	Chase Venters <chase.venters@...entec.com>, ellis@...nics.net,
	w@....eu (Willy Tarreau), linux-kernel@...r.kernel.org
Subject: Re: bogofilter ate 3/5

On Thu, 7 Sep 2006, Krzysztof Halasa wrote:

> Chase Venters <chase.venters@...entec.com> writes:
>
>> You can check the From: or envelope sender against the subscriber
>> database. Forgery isn't a concern because we're not trying to stop
>> forgery with this method.
>
> That's the first problem.
>

The problem with trying to stop forgery is that there is not yet a 
foolproof or reasonably foolproof method of doing so. All available 
options require cooperation from other MTAs, MUAs, users or 
administrators; hence, they're only good at increasing 'HAM' score.

It is also at least partially unapplicable to LKML since this list 
deliberately allows anyone to post.

>> The perl script behaves as an optional autoresponder. Autoresponders
>> would respond to spam as well (well, unless you put a spam filter in
>> front of them, but I assume that many don't).
>
> Yep. Sending their "responses" to innocent people, instead of spam
> senders. That's what many "antivirus" do.
>
>> Also note that a number of people (myself included, at work anyway)
>> have perl scripts that respond to all incoming mail and require a
>> reply cookie from original envelope senders. We do it because it
>> almost entirely prevents spam from arriving in our inboxes
>
> Sure. Don't you think is also prevents a lot of legitimate mail?
> Hope that all addresses you send mail to are automatically added
> to a white list? (I'm especially annoyed with people asking me for
> something, and then my answer bounces with "click somewhere"
> response).
>

Yeah, I whitelist on that address as well. And if someone does respond to 
the challenge (all it takes is reply/send, as I've used a signed VERP as 
the Reply-To), they get whitelisted. If the challenge bounces, it bounces 
to the envelope sender (a different signed VERP) which increases their 
blacklist score by 1. Get a blacklist score of 3 and I'll silently ignore 
your mail for 6 months.

Thanks,
Chase
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