Viktor Dukhovni:
> On Tue, Apr 10, 2012 at 12:28:28PM -0400, Wietse Venema wrote:
> 
> > > >    RCPT TO:<final-rcpt> ORCPT=rfc822;orig-rcpt ...
> > > 
> > > Does Postfix already send this if LMTP server advertises DSN?
> > 
> > Yes :-) It's the same code for both SMTP and LMTP.
> 
> Since in most cases the LMTP server is not a queueing MTA, I would
> recommend a delivery agent option in Postfix that suppresses DSN
> NOTIFY=... transmission to the LMTP server. Still send ORCPT, but
> handle (any final) DSN in Postfix.
> 
> DSN I think only makes sense with LMTP when the LMTP server is a
> content filter that wants to be able to selectively NAK recipients
> after content. With LMTP used to deliver to a mail store, I don't
> see the point of delegating DSN notices from the MTA to the LDA.

Sure. The LMTP defaults are historically targeted at content filters
("lmtp_assume_final = no"). I have no idea what portion of the
installed base would be affected if we were to make a compatibility
breaking change.

        Wietse

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