North American Network Operators Group
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Re: Anti-spam System Idea

  • From: Sean Donelan
  • Date: Sun Feb 15 16:43:04 2004 
On Sun, 15 Feb 2004, Jon R. Kibler wrote:
> We find that at least 85% of all spam originates from DHCP addresses. Thus, if
> a significant number of ISPs would perform port 25 egress filtering, I believe
> that it would significantly reduce spam, and force criminal spammers to develop
> completely new spamming technologies.

DialUp Lists (DUL) dns block lists permits you to ignore e-mail from
many dynamic IP addresses. You can configure your mail server to do this
today without waiting for ISPs to do anything.

Like most other "simple" solutions, how effective is it?