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

[Douglas Otis <dotis at mail-abuse.org>]

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
> to MAIL FROM, DATA, RCPT TO

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.

-Doug



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