[SpamCop-List] plz discredit this idea

[Jay]

This has got to be an obvious idea that can be easily discredited,

whoever does, please dont just say that it wouldnt work 100% of the time
and thus is no good, if it took out a significant percentage of spam,
wouldnt
it be worth doing?

What if the community of legit internet mailers and ISPs, agreed to adopt a
convention where the reverse dns of every ip would contain a code to
identify
whether that ip should be capable of port 25 mail traffic?

If all the DSL providers would put the keyword DSL in the 3rd level (or
higher)
in the reverse dns entrys of all their DSL ports, and

if cable would put 'cable' or 'CBL' likewise, and

if all ISPs and network admins put 'MAIL' in their reverse entrys for
legitimate mail servers,  and 'DIALUP' for their dialup ips,

ie,
legitmail.aol.com
DSL-port1.sprint.com (I think sprint already does put dsl in reverse)
CBL-port2.charter.net
DIALUP-port3.aol.com

Couldnt this stop a large enough percentage of spam to make it worth doing?

Do all spam programs rely on spoofing? Would such a plan eliminate all
non spoofing spam program email?

Obviously there would be a problem with getting everyone to sign on with
such a plan,
perhaps there could be a new, private email network built where the email
servers would
only talk to other servers within the group. Does anyone know where this is
already being done?

Also, why dont more ISPs block outbound port 25 for their endusers, and make
them
use the ISPs outbound mail server?  We do.  I dont get any complaints about
spam coming
out of our network anymore. Viruses are a different story of course..

Jay Teutenberg
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