From: Wietse Venema (wietseporcupine.org)
Date: Tue Jul 17 2007 - 05:58:04 CDT

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Alex:
> Hello,
>
> i'm using Postfix 2.1.5 as an zentral gateway, which routes mails von
> different customers to different gateways based on there sender domain.
> Unfortunaetly i'm get punished because Non-Delivery-Records are not
> delivered. The reason is that my gateway tries to deliver it locally,
> because there is no transport entry which matches the "from=<>" of the
> NDRs. My first idea was to rewrite this from-line but i read that this
> is specified in an rfc as normal.
> So the next idea was to set transport entry which will match NDRs.
> First i tried in transport "* : [gateway_ip]" at last entry but it
> didn't worked. Then i tried the default_transport option in the main.cf
> but the gateway still tries to deliver the NDRs locally.
>
> can somebody please help

sender_based routing has never worked. It was removed after Postfix
2.2 and was replaced by sender_dependent_relayhost_maps and
smtp_sender_dependent_authentication.

        Wietse

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