Why do gmail and mail.ru emails end up in spam?

Question

Exim

I have already spent a lot of time studying the issue, but I just can’t figure out why letters to gmail and mail ru end up in spam. By the way, Yandex mail does not get into spam. DKIM and spf checks are carried out on third-party services, but the mailru postmaster says that dmarc should be rejected or quarantined, but it is already rejected in the txt record.
Site on vps (vscale) with ubuntu 16 and installed vesta cp. Mail services: exim4+dovecot+clamav-daemon+spamassassin.
hostname installation as a domain: intiart.ru
Help me figure it out.
Description of my email from Google:
Delivered-To: [email protected]
Received: by 2002:ac9:23d7:0:0:0:0:0 with SMTP id j23-v6csp1662207oca;
Sat, 18 Aug 2018 03:55:43 -0700 (PDT)
X-Google-Smtp-Source: AA+uWPyUHtQ+UYPf6Z3aBxxwyXbc58vaphorM4tiaI+MQE/GtNzdPezJlRpvPISZMFg+
HUA5CNMe
Sat, 18 Aug 2018 03:55:43 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1534589743; cv=none;
d=google.com; s=arc-20160816;
ZnFuLb99Eod0OWX9U9rzH0hd9QlFibbJh6OMrxWol2L1JdyL2u = b / IYm / f89JLbGms0v
LEcZMHMNw4 / dJRKF9nTPL5ibCnQhjmn43F9A + + gEKtNc QtVeNUM1RXTHGCyuTj45XHRN
YkgmSkCSP5NyzBnQmTULyWOtuzo1nv4 / A6 + EQf0HMwbToZ3Rbq5fy8 / 7x / DXpXnuI2ZZ
l4SQZIPmMKZBp2nX2Uv + NZxj / mpS9aqbFP8hZGC4QbZQOXwSSwN7XaFMP2m9ka5zu / kV
NMSg9AXyUzYV6acizgUlSid24gC9Zb2hfcB84Ziz62Rf6lf9Y8TwthenuphZw9ExPSOF
rFog==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=mime-version:to:from:subject:date:message-id:dkim-signature
:arc-authentication-results;
bh=kqVwTGWbe1ZRG8PSA5fvfXYpZmdfW1QraUfYT67BQuY=;
= OEdKMCKPJLYIFc9ReJzsqlRZQRClAwrkS5liVLNTcc + b BtvKqEmArMoqk / G6wX5qD0M
geHahl1Wxh1lb5JzEl7U9zPwtlHfs2knySQ / FWmnYfeImzWOPNEs5NVfO0pzbsaTshAs
79T / 8Gau4FqoDJKbLRb5WbyU5qVpyV1jKn9MVnvvvksqGf3Fyq76MF6O7iIuFnFX2W23
22yoA9AjfIzhGZ3ApfE2Y2s / NU / moypHzkFTnNlR9YqQjsf89XrEM4fCeG0PGEkDue8p
K2Pl9JitBMRXnOv96zvRLcWxq5oNryxSZHTMwRJX0rXkQTM7Zwg1HgLZsdwNtYGCxAG8
4iDw ==
ARC-Authentication-Results: i=1; mx.google.com
dkim=pass [email protected] header.s=mail header.b=qw1RUFJJ;
spf=pass (google.com: domain of [email protected] designates 95.213.251.19 as permitted sender) [email protected];
dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=intiart.ru
Return-Path:
Received: from intiart.ru (intiart.ru. [95.213.251.19])
by mx.google.com with ESMTPS id h4-v6si1948110lfc.93.2018.08.18.03.55.43
for
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Sat, 18 Aug 2018 03:55:43 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 95.213.251.19 as permitted sender) client-ip=95.213.251.19;
Authentication-Results: mx.google.com;
dkim=pass [email protected] header.s=mail header.b=qw1RUFJJ;
spf=pass (google.com: domain of [email protected] designates 95.213.251.19 as permitted sender) [email protected];
dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=intiart.ru
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=intiart.ru;
s=mail; h=Content-Type:MIME-Version:To:From:Subject:Date:Message-ID; bh=kqVwTGWbe1ZRG8PSA5fvfXYpZmdfW1QraUfYT67BQuY=; b = qw1RUFJJYw9L0LodrnprmwnhkP vkkXKOMjEwTnn74A + eBL3vy42PKO91vpVV3dlLr0IU5EP3HLcWQH8sCxMrB1WHb8p0Kt3wr0sYEOC nkdjjvV9gW3mHT8UV9PDmojDjnu30yeLbmhYLGprXmFx7tFcjd9M / yXqQ + czqakB0org =;
Received: from intiart.ru ([95.213.251.19]) by intiart.ru with esmtpa (Exim 4.86_2) (envelope-from ) id 1fqytT-0000lm-A2 for [email protected]; Sat, 18 Aug 2018 13:55:43 +0300
Message-ID: <[email protected]>
Date: Sat, 18 Aug 2018 10:55:43 +0000
Subject: sad
From: [email protected]
To: drutskiytest @gmail.com
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="_=_swift_1534589743_4dddc15dafb93494625c5e6c39f38982_=_"
--_=_swift_1534589743_4dddc15dafb93494625c5e6c39f38982_=_
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
[IntiArt]( http://intiart.ru)
# =D0=97=D0=B4=D1=80=D0=B0=D0=B2=D1= 81=D1=82=D0=B2=D1=83=D0=B9=D1=82=D0=B5!
asdas
=D0=9F=D0=B5=D1=80=D0=B5=D0=B9=D1=82=D0=B8 =D0=B2 =D0=BC=D0=B0=D0=B3=D0=B0=
=D0=B7=D0=B8=D0=BD: intiart.ru
=D0=A1 =D1=83=D0=B2=D0=B0=D0=B6=D0=B5=D0=BD=D0=B8=D0 =B5=D0=BC,=D0=90=D0=B4=
=D0=BC=D0=B8=D0=BD=D0=B8=D1=81=D1=82=D1=80=D0=B0=D1 =86=D0=B8=D1=8F IntiArt
=C2=A9 2018 IntiArt. All rights reserved.
--_=_swift_1534589743_4dddc15dafb93494625c5e6c39f38982_=_
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Records:

PTR record:

Ports 25 and 2525 open

Answer 1

https://whatismyipaddress.com/blacklist-check

Answer 2

[email protected]:~# nslookup 95.213.251.19
19.251.213.95.in-addr.arpa      name = intiart.ru.

Authoritative answers can be found from:

[email protected]:~# nslookup mail.intiart.ru
Server:         127.0.0.53
Address:        127.0.0.53#53

Non-authoritative answer:
Name:   mail.intiart.ru
Address: 95.213.251.19

often they don't like it.

Answer 3

1. Check server ip for availability in RBL databases.
2. Does a clean letter with absolutely neutral text (without links, advertising slogans, etc.), sent not in bulk, but in one or two copies, reach the inbox?
3. The same letter (identical to the one you specified), but sent not through this mail server (intiart.ru) and not from addresses in the intiart.ru domain, but, for example, from a free mail account or another corporate mail server and the address arrives at inbox? If not, look for the reason in the text of the letter, a content ban is possible.
4. How long is the mail server?