From: Wietse Venema (wietseporcupine.org)
Date: Tue Oct 17 2006 - 05:41:02 CDT

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Rene van Hoek:
> Wietse Venema wrote:
> > Rene van Hoek:
> >> Hello,
> >>
> >> Postfix 2.3.x support fully dsn. With dsn, an remote mua or mta can
> >> specify of which events to get informed (delayed, failed, success). See:
> >> http://www.postfix.org/DSN_README.html
> >>
> >> My question is, how does this relate too the delay_warning_time setting?
> >
> > That is not specified in the RFC documents.
> >
> > Wietse
> >
> Hello,
>
> Let me clarify.
>
> As described in http://www.postfix.org/DSN_README.html:
>
[deleted]
>
> So I am wondering how the above relates too the 'delay_warning_time' setting.

Citing RFC 3461

   + A NOTIFY parameter value containing the keyword "DELAY" indicates
      the sender's willingness to receive "delayed" DSNs. Delayed DSNs
      may be issued if delivery of a message has been delayed for an
      unusual amount of time (as determined by the MTA at which the
      message is delayed), but the final delivery status (whether
      successful or failure) cannot be determined. The absence of the
      DELAY keyword in a NOTIFY parameter requests that a "delayed" DSN
      NOT be issued under any conditions.

All possible delay_warning_time settings are compliant with RFC
3461, including the setting where the MTA never sends DELAY
notifications.

In other words, RFC 3461 is totally unrelated to delay_warning_time settings.

        Wietse

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