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_hostnameThe 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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