On Aug 15, 2007, at 2:06 PM, Keith Moore wrote:
and I've had more than my share of legitimate mail fail to be
delivered (in either direction) because of such measures. you may
consider that legitimate for your or cisco's purposes. whether to
throw away mail that can potentially be from customers is a
business decision that cisco can make. that doesn't mean it's a
reliable way to run a network.
Keith,
More agree with you than you might expect. To make email more
robust, email delivery can change into being nothing more than a
signaling protocol. Instead of messages, the entire body of the
message is replaced by an encoded link.
From local-part(_at_)example(_dot_)com is derived from a link in the form of:
https://<example.com>/<~local-part>/<double hash of content and time>
The double hash coupled with 404 error rate-limiting offers security,
where web logs would be used to indicate whether a recipient received
a message. The SMTP server can accept all messages and not be
concerned about DSNs that are no longer needed or used. There would
not be any cryptographic signatures of the message or path
registrations to place a burden upon recipients when deciding where
the message originated. Security could be further enhanced by
utilizing some version of Open-ID.
All messages can be accepted without costing much in the way of
storage and without creating concerns about message disposition. The
responsibility of what gets tossed is directly controlled by the
recipient. The recipient can decide by using whatever reputation
system they wish. The integrity of the delivery system would depend
upon feedback given the sender by the server publishing their
messages. For the transition, existing clients might depend upon the
recipient to click on a message link, or to apply some automated
reputation/selection process plugin.
The growing lack of DSNs would drive the remaining portion of email
users into depending upon message links and message publishing rather
than using SMTP to send whole messages. Perhaps the current
situation provides enough motivation to change.
-Doug
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