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Re: Better to do 550 instead of 450 for these?
From: Arnt Gulbrandsen (arnt
gulbrandsen.priv.no)
Date: Sun Jan 01 2006 - 16:03:08 CST
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Roger B.A. Klorese writes:
> Victor Duchovni wrote:
>> Postfix never returns 5XX for temporary lookup problems, even when it
>> returns 5XX for NXDOMAIN and other hard failures.
>
> How is NXDOMAIN any more a "hard" failure? An authoritative server
> could be temporarily misconfigured...
In that case, the name server tells you "I am authoritative and I know
there is no such domain". It's not telling you "there never was", it's
not telling you "there never will be", but what it is saying is
qualitatively different from "I can't resolve that domain right now",
and so deserves different treatment.
Arnt
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