请帮忙，这不是重复的。我已经浏览了网上能找到的所有答案，尝试了不同的方法，但我仍然无法让它不进入垃圾邮件文件夹。
运行 postfix、dovecot、mysql、spamassassin 并使用 Let's Encrypt SSL、DKIM 有效、SPF 传递甚至 DMARC 传递，设置 PTR 记录。我甚至配置了 ClamAV 和 Amavis，认为这可能会有帮助，但没有，仍然进入垃圾邮件文件夹。
主机名是 mail.devexus.net
/etc/hosts 文件
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
这是一封被归为垃圾邮件的邮件的标题
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
检查了 IP，它没有被列入任何地方的黑名单。
那么还可能存在什么问题呢？
问题可能与“接收自”以及主机和主机名有关吗？
问题出在“mail.devexus.net”吗？我应该删除 mail. 并只保留 devexus.net 吗？
这是在 linode 上托管的，这会是个问题吗？
我真的快要疯了，花了两三天的时间才弄清楚这个问题 :/