On Tue, 20 May 2008, Douglas Otis wrote:
However, BATV problems and the need for outbound server co-ordination
disappear by implementing the same BATV hash authentication mechanism
within the Message-ID, rather than within the Return-Path as BATV does.
That doesn't work, because a significant proportion of blowback does not
contain any of the original message - for example vacation messages. Also,
you lose the advantage of cheap envelope-time rejection.
Moving this authentication mechanism into the MUA would also remove the
authentication burden from SMTP.
That would unnecessarily increase the junk mail load on the message store
and MUA<->MS connection.
Reliance upon the MUA recognizing its own messages
Lots of people use more than one MUA - for us it's 15% - 20%.
Tony.
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