At 12:18 AM 6/27/2003 -0700, Howard Roth wrote:
[..]
Here's an idea about validating a message before I can ever see it. This
can be considered a consent-based concept, as it can be a parameter at the
ISP end for each mail user. It adds quite a bit of overhead to the mail
server as it requires two additional messages for each one sent. I see it
being part of the MTA process. I send a message to someone. The MTA
replies to the message with a "proof of sender request, " basically a
specially formatted email message that goes back to the server that sent it
based on the return address. The sender's MTA responds with a "confirmation
request" if it did send the message and the message is now available for
download based on moving it from the pending directory to a user directory.
If there is no response within a certain period the message is discarded.
[..]
This has been proposed before by John Fenley as part of C/R systems (see
this message
http://www1.ietf.org/mail-archive/working-groups/asrg/current/msg05173.html).
I was thinking of putting it into the CRI protocol that Eric Dean is
working on.
Yakov
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