Anoying Peter Whalley Spam messages.
Paul Howarth
paul at city-fan.org
Mon Apr 4 20:39:10 UTC 2005
On Mon, 2005-04-04 at 15:29 -0500, Aleksandar Milivojevic wrote:
> David Hoffman wrote:
>
> > I have been using TMDA on one of my other accounts since March 15,
> > 2003, and since then, I have received a total of 6 spams. Over 114000
> > have been blocked by the first methods, and another 13400+ were
> > blocked by Spamassassin. The remaining 1300+ that passed those checks
> > were from spammers not responding to TMDA challenges. The six that got
> > through were because spammers used real e-mail addresses and got the
> > challenge messages and then responded to them.
>
> The question is how many legitimate messages you lost in past years,
> because people who sent them were not willing to respond to your
> chalanges? Before you start convincing people how great TMDA is, couple
> of facts:
>
> TMDA is advertised to have zero false positives. This is lie. Not all
> people will be willing to respond to challenges. Some will simply
> ignore them because it is a waste of sender's time. There will be false
> positives. Users of TMDA are simply loosing some of the legitimate (and
> possibly valuable) email sent to them. This is especially true when you
> post to the list, and people reply off the list for whatever reason.
>
> TMDA challenges often visually look like spam or other types of
> commercial mail. HTML email with nice graphics and click here link.
> Some folks will not even read it before deleting it. They'll never know
> they even got the challange. More lost email for you.
>
> Many TMDA users will tell you "but I haven't had any friend
> complaining". It doesn't count. Friends will recognize your name in
> headers. They'll probably read the spam you send them. They'll
> probably put with whatever you throw at them. That is why they are your
> friends. It is the people that do not know your name, and you don't
> know their name, where you start loosing email without ever realizing it.
>
> TMDA anoys people. Period. Even if they reply to chanlenges, most of
> them are anoyed they had to jump through the loops in order to
> communicate with you. The fact you don't know they are anoyed (or don't
> care to know) doesn't mean they are not anoyed.
My personal opinion is that challenge-response anti-spam filters are a
way of cost-shifting the spam filtering from recipient to (putative)
sender (i.e. usually a forgery these days). In other words, sending
challenges is no better than spamming. So my policy is to acknowledge
challenges for messages I didn't send (spam) and not for mail that I did
send (ham). So challenges sent to me result in either a false negative
(spam) or false positive (ham). And I'm not the only person that does
this.
Paul.
--
Paul Howarth <paul at city-fan.org>
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