Victor.Duchovnimorganstanley.com:
> On Mon, 26 Aug 2002, Michael Tokarev wrote:
>
> > Caution. This is not "defer", but ... errm... "dunno if reject"
> > maybe. Should not be confused with "deferred queue" or something
> > like. Having "hold" here, it's too easy to be confused.
> >
>
> It is defer_if_reject in the sense of returning a 4XX code to the sender
> if subsequent restrictions reject the message.
>
> The defer_if_accept is likewise return a 4XX if subsequent restrictions
> accept the message (or fall of the end with DUNNO).

I implemented both of these before the weekend and expect to turn
it on today on my own system. I do not expect to share this code
with anyone until it has been running for a while.

Quoting from the preliminary release notes:

    More sophisticated handling of UCE-related DNS lookup errors.
    These cause Postfix to not give up so easily, so that some
    deliveries will not have to be deferred after all. This affects
    the following restrictions:

    - permit_mx_backup (defer the request if any subsequent
    restriction would cause the request to be rejected, accept the
    request if any subsequent restriction would cause the request
    to be accepted);

    - reject_unknown_hostname, reject_unknown_sender_domain and
    reject_unknown_recipient_domain (defer the request if any
    subsequent restriction would cause the request to be accepted,
    reject the request if any subsequent restriction would cause
    the request to be rejected).

By now I really want to finish that TCP map so I can do sender
address verification (hold off mail until an off-line process has
verified that mail for the sender address would be accepted).

        Wietse
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