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.
--
Viktor.
