It may be because a.prnk.cz doesn't has it's own MX record, so GMail
assumes somebody is trying to spoof non-mail A records from domain
prnk.cz and uses DMARC for this domain. Try to add MX.

08.12.2016 14:59, Petr Novák via dmarc-discuss пишет:
> Well I just tried to make the email as simple as possible :). Even
> when I sent the email with all proper headers it still gets rejected
> the same way.
>
> for example this one got rejected as well:
> **************************************************************
> Return-Path: <[email protected]>
> Received: from prnk.prnk.cz (prnk.prnk.cz [10.0.2.15])
>     by prnk.prnk.cz (Postfix) with ESMTP id E077B2798F69
>     for <[email protected]>; Thu,  8 Dec 2016 12:51:33 +0100 (CET)
> Date: Thu, 8 Dec 2016 12:51:33 +0100 (CET)
> From: [email protected]
> To: [email protected]
> Message-ID: <[email protected]>
> Subject: aaa
> MIME-Version: 1.0
> Content-Type: multipart/alternative;
>     boundary="=_a1399458-aa36-431b-861a-e927d9c85f0e"
> Thread-Index: uTsORSf5VFIl+ac9kFTxbCe3gSuS3w==
> Thread-Topic: aaa
>
> --=_a1399458-aa36-431b-861a-e927d9c85f0e
> Content-Type: text/plain; charset=utf-8
> Content-Transfer-Encoding: 7bit
>
> aaa
> ***************************************************************
> <[email protected]>: host gmail-smtp-in.l.google.com[64.233.184.27]
> said:
>     550-5.7.1 Unauthenticated email from prnk.cz is not accepted due to
>     domain's 550-5.7.1 DMARC policy. Please contact the administrator of
>     prnk.cz domain if 550-5.7.1 this was a legitimate mail. Please visit
>     550-5.7.1  https://support.google.com/mail/answer/2451690 to learn
> about
>     the 550 5.7.1 DMARC initiative. 203si12899503wme.104 - gsmtp (in
> reply to
>     end of DATA command)
>
>
> Best Regards
>   Petr
>
>
> Dne 08.12.2016 v 12:40 David Woodhouse napsal(a):
>> On Thu, 2016-12-08 at 12:23 +0100, Petr Novák via dmarc-discuss wrote:
>>>
>>> thanks for the answer. I tried it with the empty line but the result
>>> is still the same.
>>
>> Still invalid as it lacks Date: header. And it SHOULD have a Message-Id
>> header too. And probably other things. ISTR it needs at least one of
>> Cc: and To: headers too?
>>
>> But those are also *probably* not relevant. Unless Google is giving
>> crappy error messages. Nobody ever gives crappy error messages right?
>>
>> -- 
>> dwmw2
>>
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-- 
Vladimir Dubrovin
@Mail.Ru
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