On Wed, Jan 11, 2017 at 09:53:21AM -0500, Viktor Dukhovni wrote:
> > On Jan 11, 2017, at 9:44 AM, Wietse Venema <wie...@porcupine.org> wrote:
> >
> > Thanks for spotting that. What about adding some text:
> >
> > Note: The smtp(8) and lmtp(8) delivery agents can make delivery
> > attempts to multiple MX or A destinations. Unlike
> > (smtp|lmtp)_reply_filter, the (smtp|lmtp)_delivery_status_filter
> > is applied only to the result of the last delivery attempt.
>
> That looks rather good to me, so go ahead.
Perhaps one could mention that "last delivery attempt" is
recipient-specific. For 2XX and 5XX responses no further MX hosts
are tried, while for a 4XX response another MX host may be tried,
and the DSN filter will apply to the either the first 2XX or 5XX
response or the last 4XX response.
Users who want to process each and every response as it happens
should use the reply filter instead.
--
Viktor.
