On Mon, Jul 03, 2017 at 07:09:29PM +0200, Joachim Fahrner wrote:
> I get lots of those errors in my postfix log:
>
> Jul 3 18:09:16 server postfix/smtpd[2840]: NOQUEUE: reject: RCPT
> from tupac2.dyne.org[178.62.188.7]: 450 4.7.1 <tupac2.dyne.org>:
> Helo command rejected: Host not found;
> from=<dng-bounces@???> to=<jf@???> proto=ESMTP
> helo=<tupac2.dyne.org>
>
> Is there some configuration problem with the list mail server?

I'm not seeing this here, and the A record for tupac2.dyne.org
resolves correctly. Could there be a DNS issue on your end perhaps?

Greg


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