[SpamCop-List] Re: Backscatter

[Steven Maesslein]

On Mon, 1 Aug 2005 05:05:41 -0500, Miss Betsy coughed into spamcop and 
left this in <dckrp9$445$1 at news.spamcop.net>:

> But that wouldn't matter since, presumably, he signed up for the
> mailing list and has it on his whitelist already.  And mailing
> lists don't change without warning subscribers because so many
> people do have whitelists.

You'd be surprised how many people *do* challenge mailing list traffic 
(ever posted anything to bugtraq, which is supposed to be populated by 
clued up people?).

Their crapware is malconfigured for 2 reasons:

1) It sends the challenge to the address in the From: header, not to the 
SMTP FROM: address, which is reproduced in the Return-Path: header.

2) It sends challenges to stuff which is easily identifiable as list 
traffic through the RFC2369 headers.

-- 
Steve

BASIC:
        A programming language.  Related to certain social diseases
        in that those who have it will not admit it in polite company.