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Re: [Asrg] pre-rfc thought balloon: ESMTP DATAFIRST

2006-06-05 15:03:27

On Jun 5, 2006, at 2:29 PM, David Nicol wrote:

The new ESMTP extension is tentatively called "DATAFIRST"

When a server identifies itself as supporting the DATAFIRST extension,
the SMTP transaction may be re-ordered from MAIL FROM, RCPT TO, DATA

This would the commit servers into accepting data without being provided any clue the sender knows who would be available to receive the information. A better system would seem to be a call-back mode for the data.

A new ESMTP extension DATA-CALLBACK.

The current DATA phase becomes a the header only portion of the message. A new header also provides a token used by the MUA to retrieve the rest of the data. The recipient could check the DKIM signatures before deciding whether the signing domain had a suitable reputation before even requesting the information. The bulk of the message would be held by the sender rather than by the intermediary for the recipient.


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