Re: Challenge-response mail filters considered harmful
On Sun, Aug 03, 2003 at 05:27:02PM -0500, Ron Johnson wrote:
> On Sun, 2003-08-03 at 13:37, David Fokkema wrote:
> > As filtering is a spam-reduction system, so is C-R. The chance of
> > receiving spam from a whitelisted address is, in the experience of tmda
> > users, very rare. And even if it happens, it only adds up to low
> > statistics.
> As it turns out, just *today*, I received spam seemingly from
> charter.net (but that may have just been a relay).
> However, look what was spoofed:
> Return-Path: <email@example.com>
> From: Matthew Graybosch <firstname.lastname@example.org>
> Subject: Re: Terminal error
> Matthew Greybosch is know to me from the Libranet mailing list, and
> so is the Subject.
A very clever spammer, indeed! I hope the number of similar spams to you
will not increase dramatically...