Why aren't SPF and DMARC checked?

Question

SPF

Mail is sent from the server, plus from Yandex. In this example, Yandex DKIM DMARC has been removed, because everything works there.
All entries are set up and working.

Checking for handshakes.
https://mxtoolbox.com/domain/dairub.ru/
However, even there are no errors, stupidly there is no check for either SPF or DMARC

Received: from mxfront9g.mail.yandex.net ([127.0.0.1])
  by mxfront9g.mail.yandex.net with LMTP id gEJINozk
  for <[email protected]>; Thu, 22 Nov 2018 21:47:18 +0300
Received: from ks05.ru (ks05.ru [95.216.36.253])
  by mxfront9g.mail.yandex.net (nwsmtp/Yandex) with ESMTPS id xF9meubYN7-lHEGELsv;
  Thu, 22 Nov 2018 21:47:17 +0300
  (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
  (Client certificate not present)
Return-Path: [email protected]
X-Yandex-Front: mxfront9g.mail.yandex.net
X-Yandex-TimeMark: 1542912437
Authentication-Results: mxfront9g.mail.yandex.net; dkim=pass [email protected]
X-Yandex-Spam: 1
Received: from localhost (localhost.localdomain [127.0.0.1])
  by ks05.ru (Postfix) with ESMTP id B0B1CF00EFB
  for <[email protected]>; Thu, 22 Nov 2018 21:47:16 +0300 (MSK)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dairub.ru; h=date
  :date:message-id:x-mailer:from:from:subject:subject; s=default;
   t=1542912434; x=1544726835; bh=frcCV1k9oG9oKj3dpUqdJg1PxRT2RSN/
  XKdLCPjaYaY=; b=Vn3IjcFOHx3TEdyoKs9XXYcRerXbDozQoXTzMoLAb6qgHbai
  6gUypyYiiYFOWF6g/Awhhjl/6wnmp+GxyTm+1nSdAbui1KLC8sJTfeNgTi0XMijP
  pecC/LF86LMrl+rD6DF42b4IzQ0kINjIdDmhIEM5LzyxHMDRHxmMKw5d+/Y=
X-Virus-Scanned: Debian amavisd-new at ks05.ru
Received: from ks05.ru ([127.0.0.1])
  by localhost (ks05.ru [127.0.0.1]) (amavisd-new, port 10024)
  with ESMTP id ZTugkeoq1C8O for <[email protected]>;
  Thu, 22 Nov 2018 21:47:14 +0300 (MSK)
Received: by ks05.ru (Postfix, from userid 5013)
  id E5F33F00F18; Thu, 22 Nov 2018 21:47:14 +0300 (MSK)
To: [email protected]
Subject: the subject
X-PHP-Originating-Script: 0:mail.php
From: [email protected] 
X-Mailer: PHP/5.6.38-2+0~20181015120829.6+stretch~1.gbp567807
Message-Id: <[email protected]>
Date: Thu, 22 Nov 2018 21:47:14 +0300 (MSK)
X-Yandex-Forward: 107bce4f08bc9bf13e66c15aa5ddb76a

Maybe something in postfix ?
dairub.ru/main.cf.txt
dairub.ru/master.cf.txt
dairub.ru/phpinfo.php

Answer 1

The fact that not all the information is in the headlines does not mean that something does not work. You have everything set up and working properly. Unless, DMARC on the server will not work.
MXTOOLBOX has already checked the correctness of DKIM, DMARC and SPF records, and the headers show that spf=pass.
The only thing is that you need to set up an entry in Reverse DNS, and that it matches the hello of the SMTP server