So, before worrying about paying to send, it makes more sense to me
to implement proving who the sender is first. This leads to
identifying "bad senders" first, which can be used to determine if
they are actual spammers are victims, and if victims, to get their
systems cleaned up, and if they persist in not cleaning up, then in
getting them booted from the ISP (or SMTP provider if a business,
etc.), blacklisted and/or turned over to authorities as a provable
spammer.
Sounds good to me.
I still think there's some interesting research to be done about what
you'd do with reliable sender identities. It's easy enough to
whitelist mail from people you already know, but is there anything
clever one might do with an identity that you can trust to be stable
but you know nothing else about?
R's,
John
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