El correo de Postfix se convierte en spam en Gmail y Hotmail (intenté todo, pero todavía no puedo solucionarlo)

El correo de Postfix se convierte en spam en Gmail y Hotmail (intenté todo, pero todavía no puedo solucionarlo)

Que alguien me ayude por favor, esto no está duplicado. Revisé todas las respuestas que pude encontrar en la web, probé diferentes cosas pero todavía no puedo evitar ir a la carpeta de spam.

Al ejecutar postfix, dovecot, mysql, spamassassin con Let's Encrypt SSL, DKIM válido, pases SPF e incluso pases DMARC, se establece el registro PTR. Incluso configuré ClamAV y Amavis pensando que eso podría ayudar, pero no, todavía va a la carpeta de spam.

el nombre de host es mail.devexus.net

archivo /etc/hosts

127.0.0.1       localhost.localdomain locahost
127.0.0.1       mail.devexus.net mail.devexus.net

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Aquí está el encabezado de un correo que se convirtió en spam.

Delivered-To: ******[email protected]
Received: by 10.223.157.140 with SMTP id p12csp2909027wre;
    Sun, 25 Feb 2018 07:51:44 -0800 (PST)
X-Google-Smtp-Source: AH8x2255Y4AJYhkzAtmNyXjg6EXKfjKkDdW4PEpRAU7WNCosBkiBYoIY9mVfHqjwzW8JIO8FXzBr
X-Received: by 10.223.153.51 with SMTP id x48mr6599051wrb.216.1519573904411;
    Sun, 25 Feb 2018 07:51:44 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1519573904; cv=none;
    d=google.com; s=arc-20160816;
    b=PQ3hgo3pcKq5shaqCnhyL/LuZi4XTqCYeRzs2z+i3idyjKojNI6W0dOwUcsQ6HvLVP
     06ydM+/EskBiSPCq/3XJA8hjZtZJM3gEn1ih/3jgQ+xX9OorFijNJbx5SDI32VQzgqI7
     baDdWnY1kzadUt/O5Tvq3UamrL4LXuMu6MPTCWdcyIf30kj5YbZEExRWm6OT5ajxJpzH
     Z8v5hfhpMrhmKzjZOIIz0zqfvEU5tWioWsfeT7CeY0Xwr20g2sY7vsgiduPc4dQW8Ap/
     c6MjjqnvBZZtR6az7wC1tDBwUabStYd3awDdeKKAM0T5CEH4vvp3cx29438Kld97vO22
     WJcg==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
    h=content-language:thread-index:mime-version:message-id:date:subject
     :to:from:dkim-signature:arc-authentication-results;
    bh=Z3lrmhLvqaXWgZHr1L2mZDXf0ZVz4IExOW69HEUJfb4=;
    b=0BJAYc50K6tzZfso9gBAkj+fKwvgBzKLqbg0lY8wVFufwmt+E87QLNLL/1lAkumYzH
     FwvI0tl0iwgI+NTZZlwombAkk/YQ794g0HwPy25ytHuJWZPLMuiM+AUnyyESdFmvt19q
     nwuiQBxQVf40UdheSZsEZdF4ya1ryxcCWPQe6b3rAJ5dxpkmexbRAAi/8+j/PNZhHH7w
     NB91BWUez779FUUSJ514lorX+EslrdbdnxybSjsuOQQvtk+jiIrjAYBsimMW7ERXhXDf
     eKNXKDHlHqxe7Yxy5YwEccbQgNAzUtYYyBWqSL4gXObxBpoSwsxO6aZKFIYxmb+SBML/
     dHkg==
ARC-Authentication-Results: i=1; mx.google.com;
   dkim=pass [email protected] header.s=dkim header.b=emYycQeQ;
   spf=pass (google.com: domain of [email protected] designates 139.162.133.174 as permitted sender) [email protected];
   dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=devexus.net
Return-Path: <[email protected]>
Received: from mail.devexus.net (mail.devexus.net. [139.162.133.174])
    by mx.google.com with ESMTPS id g85si303716wmc.109.2018.02.25.07.51.43
    for <******[email protected]>
    (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
    Sun, 25 Feb 2018 07:51:43 -0800 (PST)
Received-SPF: pass (google.com: domain of [email protected] designates 139.162.133.174 as permitted sender) client-ip=139.162.133.174;
Authentication-Results: mx.google.com;
   dkim=pass [email protected] header.s=dkim header.b=emYycQeQ;
   spf=pass (google.com: domain of [email protected] designates 139.162.133.174 as permitted sender) [email protected];
   dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=devexus.net
Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.devexus.net (Postfix) with ESMTP id 55F9C40611 for <******[email protected]>; Sun, 25 Feb 2018 16:51:43 +0100 (CET)
X-Virus-Scanned: Debian amavisd-new at devexus.net
Received: from mail.devexus.net ([127.0.0.1]) by localhost (mail.devexus.net [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kqtOTuX741RJ for <*****[email protected]>; Sun, 25 Feb 2018 16:51:42 +0100 (CET)
Received: from DESKTOP7GKF188 (unknown [178.255.152.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.devexus.net (Postfix) with ESMTPSA id 866AC40610 for <*******[email protected]>; Sun, 25 Feb 2018 16:51:42 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=devexus.net; s=dkim; t=1519573902; bh=P9Z5q9aBS0MUY38+pDbc0mHCDxxG0wexgOdThxSzofY=; h=From:To:Subject:Date:From; b=emYycQeQi2isvGEuU4MLbaI1lZ2mQRW18Um4bHJZtj1zCiQepXd190e9mFwI4/uAO
 99pFnrrYAQ5Ps6RDgOvt3CB1wkix9tA+olq7v2KZeHdKhOT1VFDsSKP3Juz6b0cPAo
 jTiZe2D+g+f6/v6g8AN3qm12xVirCMdJGITlBJic=
From: "Ivan Katić" <[email protected]>
To: <******[email protected]>
Subject: Checking how are you
Date: Sun, 25 Feb 2018 16:51:40 +0100
Message-ID: <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/related; boundary="----=_NextPart_000_0014_01D3AE58.E924E260"
X-Mailer: Microsoft Outlook 15.0
Thread-Index: AdOuUH8IeFWERzCMR9u6GZm4/M8Ohg==
Content-Language: hr

IP comprobada, no está en ninguna lista negra.

Entonces, ¿cuál podría ser el problema?

¿El problema puede ser algo relacionado con "Recibido de" y los hosts y el nombre de host?

¿Es "mail.devexus.net" el problema? ¿Debo eliminar el correo? y solo salir con devexus.net?

Esto está alojado en Linode, ¿podría ser un problema?

En serio me estoy volviendo loco, han pasado 2 o 3 días tratando de resolver esto :/

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