In brief how about:
A) Each ISP creates stamps according to some accepted method,
probably some cryptographic approach. Think SSL certificates or
some similar precedent.
B) They attach a stamp to mail according to some policy such
as e-mail originating from their customers.
C) Stamps can be allocated according to any policy they choose, at
least at first. For example, give each customer 1,000 stamps per
month and charge for excess, whatever, that's a marketing decision.
D) However, other ISPs can choose to transit or not email with
particular stamps.
E) Unstamped mail could be accepted for a while and then ISPs can
choose to reject it.
This is a fine plan. In fact, it already has a name -- it's domain
keys (with an implementation tweak that ISPs rate limit their retail
customers' mail, which is a reasonable idea on its own). Each domain
signs its own mail, the keys to check the signatures are in the DNS,
and recipients can do whatever they want with mail signatures.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
http://www.taugh.com
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