Re: [Asrg] Turing Test ...

[wayne <wayne@midwestcs.com>]

In <14363.1049678986@kanga.nu> J C Lawrence <claw@kanga.nu> writes:

> On 06 Apr 2003 19:12:21 -0500
> wayne  <wayne@midwestcs.com> wrote:
> > In <8405.1049662670@kanga.nu> J C Lawrence <claw@kanga.nu> writes:
> 
> >> Filtering returning bounces based on Message-ID requires that the MX
> >> keep a DB of known-valid IDs.  This is a non-trivial expense.
> [ ... ] 
> 
> Am I missing something here, is abuse via bounces really common and
> growing?

Well, the bounces really are annoying to people who have their email
addresses forged by spammers.

However, there is another use for this kind of database of all known
message-IDs that have been (recently) sent.  Right now, spammers can
use a MAIL FROM:<> in order to escape some verification techniques.


-wayne


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