Throw away the Internet and start over?
jm at jmason.org
Wed Apr 23 15:04:56 PDT 2003
R. A. Hettinga said:
> I've talked for years about a simple modification of an old protocol,
> and have jokingly called it $MTP.
> In short, $MTP is: "friends mail me free, all others pay cash".
> Unpacking the above sentence, we get:
> People on my cryptographically authenticated whitelist.
- spammers impersonating your friends, using forged To and Received
- your friends' mailing list, which sends mail as
fork-bounces at lists.xent.com?
- spam sent to the aforementioned list?
These ideas (cf. also hashcash, whitelisting in general) generally run
into those issues in SMTP -- namely there is no usable way to associate
a sender with an authenticated identity in current mail use, unless
you can persuade everyone to adopt S/MIME or PGP/GPG.
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