I have made standard mailcow installation and configuration:
domain name: mycompany.com
mailcow hostaname: mail.mycompany.com
Mostly DNS records are set:

Problem is, when sending email to internal user from the same domain, that the received mail has no SPF or DMARC and the DKIM is not signed via DNSSEC:

This is sample of such a message:
Return-Path: sender@mycompany.com
Delivered-To: receiver@mycompany.com
Received: from mail.mycompany.com ([172.22.1.253])
by 34ea2cf340d1 with LMTP
id OPaCKwUafWYkPxIAo+0U4w
(envelope-from sender@mycompany.com)
for receiver@mycompany.com; Thu, 27 Jun 2024 10:51:33 +0300
Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPA id 0335EB8C3EF6
for receiver@mycompany.com; Thu, 27 Jun 2024 10:51:32 +0300 (EEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mycompany.com; s=dkim;
t=1719474693; h=from:subject:date:message-id:to:mime-version:content-type;
bh=QMZNDJiHLd497dNAEO7QcJSW1ttOZjL7afRu/Ah8OuY=;
b=Cuu+TuaRggFVDcrloo2MULMB8hZeBHvy9ILvOMnT5TZKoZN6yFJXx8qURvcBcA99MjpZQQ
Bdkk9Nl1NWIt06KB2BlOAPpcyNxuV3P3xlISUQrUSSt98QVwH60v43l2w6gT4hByaHMcy4
1qySF9sFvg/m7wZSXNITPf90Ty/cBNhS0Tc33OB0zVfA0vFHucKotkH9H0wKa6wVH0/Uz4
ATqL4QUF+QNLZ2CorCjGkMxxThHxMK/975SJ2kyIhMmdZLj+OTA4HorhRD1G2ZetnvOKer
OX0icK0Bc4pwO3/aSGzBnubmSHLoGd0nSnpKSbqIfYNRzv69Cp//Ol24nK7KQQ==
From: “Sender” sender@mycompany.com
To: “Receiver” receiver@mycompany.com
User-Agent: SOGoMail 5.10.0
MIME-Version: 1.0
Date: Thu, 27 Jun 2024 10:51:32 +0300
Subject: =?utf-8?q?=D0=9F=D1=80=D0=BE=D0=B1=D0=BB=D0=B5=D0=BC?==?utf-8?q?=D1=81?=
=?utf-8?q?=D0=BF=D0=BB=D0=B0=D1=82=D0=BA=D0=B8=D1=82=D0=B5?=
=?utf-8?q?=D0=BE=D1=82?=
=?utf-8?q?=D0=BF=D0=BE=D0=B4=D0=BC=D1=80=D0=B5=D0=B6=D0=B0?= 200
Message-ID: <42-667d1a00-45-76d2d500@58793774>
Content-Type: multipart/alternative; boundary=“—-==-OpenGroupware_org_NGMime-66-1719474692.813884-32——”
X-Last-TLS-Session-Version: None
——==-OpenGroupware_org_NGMime-66-1719474692.813884-32——
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Content-Length: 468
=D0=97=D0=B4=D1=80=D0=B0=D0=B2=D0=B5=D0=B9,
…
…
…
…
…
——==-OpenGroupware_org_NGMime-66-1719474692.813884-32——
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Content-Length: 506
<html>=D0=97=D0=B4=D1=80=D0=B0=D0=B2=D0=B5=D0=B9,<br />=D0=BE=D1=82 =D0=
=BE=………………………………………………………………………………………………………………………..B2</html>
——==-OpenGroupware_org_NGMime-66-1719474692.813884-32——–
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Can you tell me where my settings are wrong?