[Asrg] BCP Idea: Move dynamic IP addresses to designated areas

["Walter Dnes" <waltdnes at waltdnes.org>]

  A lot of time and energy is going into trying to set up schemes to
identify who is/isn't allowed to send email.  Some of these ideas
involve inventing new DNS records.  This will take a long time to
implement in real-life.

  I suggest instead, that certain IP address ranges be set aside for IP
addresses that are not authorised to send email on port 25 to anybody
other than their ISP's gateway MTA (aka "smart host").  I reluctantly
blocked 24.0.0.0/8 sending direct to my personal domain last month.
797 out of 2997 (i.e. 26.5%) blocked email delivery attempts last month
were from that one /8.  This range is already blocked by many MTAs, why
not make it official?  There are obviously more than 16 million dynamic
addresses on the planet, so other ranges will need to be added.  Unlike
other proposals, which require modifications to DNS, this idea only
requires shuffling around of existing address ranges.  ACLs and DNSbls
already exist, and would work even better when my idea is implemented.

  Comments, suggestions ?

-- 
Walter Dnes <waltdnes at waltdnes.org>
Email users are divided into two classes;
1) Those who have effective spam-blocking
2) Those who wish they did

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