Re: Yet another anti spam approach
From: GaryM (gmaddr-usenet_at_yahoo.com)
Date: 05/11/04
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Date: Tue, 11 May 2004 11:24:35 -0000
Roedy Green <look-on@mindprod.com.invalid> wrote in
news:3hp0a01natn5rilin9fo8bsvic37oag866@4ax.com:
> I wrote them asking how it works. I'm not clear if you have to
> host a website and mailserver for this to work.
>
>
Challenge/Response systems are not new. However they are flawed. For
example, if both ends use this system, no one gets a message unless
there is a mutually agreed handshake. Getting such universal
standards established across the myriad of companies is no mean feat.
The way you describe it, one could simply programmatically visit the
link and not only does the spam get through, but you are confirmed as
a live one. Most other C/R systems use an image that can only be read
by a person.
There are a number of efforts under way to create an enhanced SMTP
protocol that aims to authenticate the sender.
http://www.pcmag.com/article2/0,1759,1473986,00.asp
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