But there is intermediate altenative - create organization with all isps as its members (kind of like ARIN/APNIC/RIPE for mail service providers) and have all downstream corporate customers be required to either also be member of this organization or relay email through its isp. Do note that
I'm *sure* that our connectivity provider will want us to forward us several million pieces of email a day, just so they can forward it along, if we decided to not join. So we have our choices of joining (probably with a membership fee), letting a provider that probably doesn't want our load relay our mail (and that will cost *them* money for a mail server hefty enough to do it), or filter port 25 because we didn't pay...
Actually I was thinking more along the lines of autentication with using SSL certicates for authentication of mail servers from member.Administering large list is a nightmare so its easier that initial or direct member get certicare from root organization and then members can themselve issue (and revoke) a certificate to large enough customers with a backroute that if mailserver does not accept your certificate, you can send email through upstream.
Looks like a good candidate for getting sued via RICO. "An offer you can't refused". Hmm... This one I agree, serious legal problems that will arise due to large marketing houses and some free-speach groups will need to be worked out. But if there are anti-SPAM laws on country-level on majority of the world and most isps agree that to some kind of mediation organization, this can be overcome.
--- William Leibzon Elan Communications Inc.