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Postfix Archives: Re: 4xx vs 5xx for spam rejects

Re: 4xx vs 5xx for spam rejects

Subject: Re: 4xx vs 5xx for spam rejects
From: Wietse Venema (wietseporcupine.org)
Date: Mon Jan 10 2000 - 14:42:17 CST

Per Marker Mortensen:
> From: Ralf Hildebrandt <R.Hildebrandttu-bs.de>
> Subject: Re: 4xx vs 5xx for spam rejects
> Date: Mon, 20 Dec 1999 14:55:36 +0100
>
> > Depends on WHERE the error was generated! If it's during a DNS lookup you
> > might get 4xx. But since one of the later snapshots it's safe to say
> >
> > unknown_address_reject_code = 554
> > unknown_hostname_reject_code = 554
> >
> > since in case of an soft error the return code is always 4xx.
>
> Where is this documented? From what version does it work this way?

I do not know where this is documented, but Postfix will fail safely
in case of DNS lookup errors when sending mail, so it should do so
also when rejecting mail.

In fact, I think the "soft_bounce" feature should be extended so
that it covers UCE restrictions as well. This way, yo can set up
UCE restrictions and test them without losing mail - the mail simply
is delayed.

        Wietse

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