Hello :)
IETF has put up an internet draft at
http://www.ietf.org/internet-drafts/draft-khanna-smtp-mail-transfer-reliabil
ity-00.txt.
This draft discusses the issue which makes the data transfer in SMTP
protocol highly vulnerable to a "resend" in case of a network
disruption. We then discuss a means by which such a "resend" can be
avoided, by transferring mail data only from the point of disruption.
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