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Title : SMTP Transferred-By-Reference (TBR) Extension
Author(s) : D. Otis, J. Leslie
Filename : draft-otis-smtp-tbr-ext-00.txt
Pages : 19
Date : 2007-11-9
This document describes an extension to SMTP that allows email to be
exchanged as a storage system immutable XAM (eXtensible Access
Method) reference. When MTAs employ the TBR mode, message
origination can not be spoofed, and message acceptance is not
asserted until retrieval of the referenced message. This strategy
ensures a minimal SMTP overhead, increasing the responsibility of
senders in order to limit the load of unwanted messages upon
receivers.
In addition, the TBR extension requires an [RFC2821] MAIL FROM
address in the same domain as the server from which the XAM will be
fetched, so that a dependable status-reporting path is assured.
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