Re: [Asrg] [IP] 4 Rivals Almost United on Ways to Fight Spam

["George Ou" <george_ou at netzero.com>]

----- Original Message ----- 
From: "Markus Stumpf" <maex-lists-spam-ietf-asrg at Space.Net>
To: "George Ou" <george_ou at netzero.com>
Cc: "Markus Stumpf" <maex-lists-spam-ietf-asrg at Space.Net>; <asrg at ietf.org>
Sent: Monday, June 28, 2004 9:55 AM
Subject: Re: [Asrg] [IP] 4 Rivals Almost United on Ways to Fight Spam


> In DE we have 6,900,000 domains vs. 144582 non-bogus IP adresses whose
> hosts are used in MX records of those domains. An authorization scheme
> based on IP addresses will be more effective, more fair and much faster
> deployed than any domain name based scheme. Even more as the percentage
> of MTA runs by clueful people by far higher than the percentage of
> domain owners that know what they need to have in X/Y/Z records for
> their domain.

That is a misleading number even if it is accurate.  What happens when
you're collocating your domain with others on the same IP address?  If you
black list an IP address that was being shared by 100 virtual domains, that
has too much collateral damage for the 99 other well behaving domains that
might be sharing the same IP address with the one bad apple.  Black listing
a domain name in a post domain level authentication world is far more
effective.  It would not matter if that domain moved to a new IP address.
However, there are times that IP level blocking is appropriate.  Ultimately,
IP and Domain level blocking will be small piece of the treatment for spam.
Sender ID and Domain Keys are just a new weapon we have in fighting spam.
It doesn't replace all of the current effective techniques of combating
spam, it complements them.

George


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