This e-mail is a presentation of an idea for comments prior to drafting the idea
into a formal request for comments document. The idea presented herein is
within the realm of e-mail practice and is therefore on-topic for the anti-spam
research group, although the idea would not directly reduce spam, as the
idea if put into wide practice would simplify the operation of large
mailing lists
on both the sending and receiving end.
The idea if implemented would ease content-based filtering at the server as
messages to multiple recipients would no longer require separate complete
transactions for each recipient when sending to servers that implement complex
per-recipient acceptance policies.
The idea is a new ESMTP extension.
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
with the full range of acceptance/delivery status response codes
available at RCPT TO
time rather than at the end of the DATA command.
--
David L Nicol
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