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From Reindl Harald <h.rei...@thelounge.net>
Subject Re: yahoo rcvd bug?
Date Mon, 20 Oct 2014 14:37:18 GMT


Am 20.10.2014 um 16:25 schrieb Axb:
> On 10/20/2014 02:56 PM, Reindl Harald wrote:
>>> seems your recursor couldn't resolve it, so your MTA added unknown...
>>>
>>> works for me:
>>>
>>> Received: from nm46-vm10.bullet.mail.bf1.yahoo.com
>>> (nm46-vm10.bullet.mail.bf1.yahoo.com [216.109.114.203])
>>
>> what happens in case of a temporary DNS error?
>>
>> postfix anserwers in such cases with a 450
>> even with "unknown_hostname_reject_code = 550"
>
> only if you do tell Postfix to do so..

no true

http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname

The unknown_client_reject_code parameter specifies the response code for 
rejected requests (default: 450). The reply is *always 450* in case the 
address->name or name->address lookup failed due to a *temporary problem*

> not relevant..

it's relevant in case the OP had a temporary DNS error because no 
nameserver responded resulting in a FP


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