我的公司使用 Postfix 从 ec2 实例发送电子邮件，但邮件被发送到所有主要提供商（Gmail、Outlook、Yahoo）的垃圾邮件文件夹。我们有一个与此实例关联的 EIP，并且已使用 Amazon 请求表单正确配置了 rDNS（这是在一周多前完成的，因此 Amazon 对 DNSBL 服务所做的更新应该已经传播）。我搜索了 mxtoolbox 和其他工具，以确认此 IP 地址未被列入黑名单并且信誉良好。Spam Assassin 为邮件内容打了满分。此外，SPF、DKIM 和 DMARC 已设置并通过，我们正在使用具有有效证书的 TLS。
以下是标题：
Delivered-To: [email protected]
Received: by 2002:a4a:b041:0:0:0:0:0 with SMTP id g1csp4098996oon;
Mon, 24 Jun 2019 08:05:40 -0700 (PDT)
X-Google-Smtp-Source: APXvYqzZndWhZBsN29EhNOp1aagTj5c5ebPVO6xY3MfTwaKYm3AvCwzwqx43rzUqhGhMDPvEHN/Y
X-Received: by 2002:a17:902:aa8a:: with SMTP id d10mr111419846plr.159.1561388740870;
Mon, 24 Jun 2019 08:05:40 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1561388740; cv=none;
d=google.com; s=arc-20160816;
b=WNFL3Vh4gd24QFNlfnPrBq3+82t33Hs10Rpk8KA8/FRU+MQQ3dDZCaG9Glw6bZhyHV
gff4qNZjwcoUnPLvkZdFlD9y6b9xa2sM7K8V419EfsOPk3n8Ny+L4/CGyo4SdAUaaD6x
GosTw29PdX+A2c+tHO8DXbqXQ4oNjBXoWKvsBdyi36OZ9o2l1jm3j7Yc10H8Q9Tq7oWf
ChsALISiOT6n0i/P+NmpKX9vVWOsEjFfPilK2DQmO9Gb49PKMCQNkvsy+7poNljccFLp
+pNLeRbVbVlv/HUy9UkGeT0ODD/gOpS7X2fkrSf6oXrfFf3hzahbWJWBEy11M7QTDciG
ZK1Q==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=dkim-signature:content-transfer-encoding:mime-version:subject
:message-id:to:from:date;
bh=UpxxmjO04XKymFt9ExFCb11J8a08/pGBjmnN3qdQWMI=;
b=Ot2pOw+u2yhiQybhndBPuJ8UxZbdV+loMcmd/fFkC5X6IPujvV8wA2CbV6LABYQCoW
Qe5lZyazF/J2uZ/x4WBk0nONiqhpI+Tdanc7+vZP1UbnMid/kWnhfvo/bv4BhjB/L94f
yDcfnknk2cMDGrKiQBuDGqKvD3gqO2YueuNiHhKrbM8bMMdXXjTynRXRRmeV0z4cYVc6
XL9s1LdXSTSccplRdvK3xdE1UuXo0WgA9qWHh/1EOTfQDs31cqmm/CX5+YDcx0j6u2Db
PDeaw5aOiOOggSqqFfEYDcbwjkq3Yk4lVU7bk43VdNWaXda1i9vVbhM0OPA3rjC5xVyn
fEpA==
ARC-Authentication-Results: i=1; mx.google.com;
dkim=pass [email protected] header.s=ps header.b=lH0AIQjr;
spf=pass (google.com: domain of [email protected] designates 1.2.3.4 as permitted sender) smtp.mailfrom=bounce+ps_5d10e6c3e59e3_663a025f87942as1mail@mailer.sender.com;
dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=sender.com
Return-Path: <[email protected]>
Received: from 5f08050601590557.smtp.sender.com (5f08050601590557.smtp.sender.com. [1.2.3.4])
by mx.google.com with ESMTPS id t5si10353297pgv.164.2019.06.24.08.05.40
for <[email protected]>
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Mon, 24 Jun 2019 08:05:40 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 1.2.3.4 as permitted sender) client-ip=1.2.3.4;
Authentication-Results: mx.google.com;
dkim=pass [email protected] header.s=ps header.b=lH0AIQjr;
spf=pass (google.com: domain of [email protected] designates 1.2.3.4 as permitted sender) smtp.mailfrom=bounce+ps_5d10e6c3e59e3_663a025f87942as1mail@mailer.sender.com;
dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=sender.com
Date: Mon, 24 Jun 2019 15:05:39 +0000
From: Sender <[email protected]>
To: [email protected]
Message-ID: <[email protected]>
Subject: Account Successfully Provisioned
Mime-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sender.com; q=dns/txt; s=ps; t=1561388740; bh=UpxxmjO04XKymFt9ExFCb11J8a08/pGBjmnN3qdQWMI=; h=date:from:to:message-id:subject:mime-version:content-type:content-transfer-encoding; b=lH0AIQjrRq7hs3mRNhwakT1vZArNTaqzm9CAkXiqBkXHodfuvovyr/H7jqCvRasK3gx7Iq+Lp4FabO6ZbNsw63eViS11YaTioCeficmrDX102QJaEHmWHEhTYfZeCwSVeN2lpL/zxZ65V9KpxOhZUaEyR0aqO4yXHTRllQNzez0=
我已将实际域名和 IP 替换为 sender.com/1.2.3.4。
你知道可能出了什么问题吗？或者我们可以做些什么来阻止我们的邮件被标记为垃圾邮件？现在 AWS 有 Bring-Your-Own-IP 服务，我们可以将 /24 与我们的帐户关联，并开始通过我们自己的 IP 发送电子邮件，但我不确定这会有多大帮助？
更新：在 Gmail 中，错误消息如下：
This message seems dangerous
Similar messages were used to steal people's personal information. Avoid clicking links, downloading attachments, or replying with personal information.
邮件内容如下：
Hello,
Your account has been successfully provisioned. To access your account, <a href="linkhere">sign in here.</a>
我们迄今为止仅向使用此 IP 的内部员工发送了少量电子邮件，这是否会影响 IP 声誉？如果会，我们可以做些什么来提高声誉？