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当原始电子邮件使用 ESMTP 标头发送时，通过 IMAP 从我们的邮箱导入邮件时，Gmail SPF 检查失败

tag-icon • tag-icon smtp dovecot exim spf gmail
当原始电子邮件使用 ESMTP 标头发送时，通过 IMAP 从我们的邮箱导入邮件时，Gmail SPF 检查失败

我们遇到了一个奇怪的情况：

  • 我们收到一封包含 ESMTP 标头的电子邮件
  • 我们的服务器接受了，没问题
  • 我们将该邮件导入 Gmail，就像从我们的邮箱导入其他邮件一样
  • Gmail 进行 SPF 检查，但失败
  • Gmail 使用我们的服务器 IP 地址和邮件发件人域来进行检查（原文如此！）

我们在本地邮箱之间发送邮件时也遇到了类似的问题（但 Gmail 使用我们的服务器域和客户端的 IP）：当通过 SMTP 从一个本地邮箱发送到另一个本地邮箱时，由于邮件中的客户端 IP 而不是服务器 IP，导入到 Gmail 的电子邮件 SPF 失败

例子：

Received-SPF: fail (google.com: domain of [email protected] does not designate 188.40.153.39 as permitted sender) client-ip=188.40.153.39;
Authentication-Results: mx.google.com;
   spf=fail (google.com: domain of [email protected] does not designate 188.40.153.39 as permitted sender) [email protected]

更多标头：

Delivered-To: [email protected]
Received: by 10.194.168.164 with SMTP id zx4csp522020wjb;
    Thu, 19 Feb 2015 06:26:04 -0800 (PST)
X-Received: by 10.180.219.66 with SMTP id pm2mr10333511wic.91.1424355964017;
    Thu, 19 Feb 2015 06:26:04 -0800 (PST)
Return-Path: <[email protected]>
Received: from server.webvizarts.com  (server.webvizarts.com . [188.40.153.39])
    by mx.google.com with ESMTPS id ge6si41332059wjd.24.2015.02.19.06.26.03
    for <[email protected]>
    (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
    Thu, 19 Feb 2015 06:26:04 -0800 (PST)
Received-SPF: fail (google.com: domain of [email protected] does not designate 188.40.153.39 as permitted sender) client-ip=188.40.153.39;
Authentication-Results: mx.google.com;
   spf=fail (google.com: domain of [email protected] does not designate 188.40.153.39 as permitted sender) [email protected]
Received: from mx.msit.gov.pl ([77.252.152.34])
    by server.webvizarts.com  with esmtp (Exim 4.83)
    (envelope-from <[email protected]>)
    id 1YOS3G-0003eP-T2
    for [email protected]; Thu, 19 Feb 2015 15:26:03 +0100
Received: from msit.gov.pl (unknown [192.168.10.30])
    by mx.msit.gov.pl (Postfix) with ESMTPS id 5BE2F3B64
    for <[email protected]>; Thu, 19 Feb 2015 15:24:48 +0100 (CET)
Received: from EX3.sport.local (192.168.10.30) by EX3.sport.local
 (192.168.10.30) with Microsoft SMTP Server (TLS) id 15.0.1044.25; Thu, 19 Feb
 2015 15:22:45 +0100
Received: from EX3.sport.local ([fe80::b8ed:df29:c87:77d2]) by EX3.sport.local
 ([fe80::b8ed:df29:c87:77d2%15]) with mapi id 15.00.1044.021; Thu, 19 Feb 2015
 15:22:45 +0100
From: John Smith <[email protected]>
To: Christopher Smith <[email protected]>
Subject: Re: Some sensitive subject
Thread-Topic: Some sensitive subject
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [192.168.0.102]

隐藏标题、邮箱名称和人名。

我们在基于 Debian 的 VPS 上安装了 dovecot+exim。

我们正在寻找一些解决方案来避免这种情况。Gmail 端的实现是否存在缺陷，或者我们可以做些什么？

编辑：根据评论，转发被误认为是导入

答案1

[...]
我们将该邮件导入 Gmail，就像导入其他邮箱里的电子邮件一样
[...]

这是错误的，因为邮件标题显示了不同的内容：

Received: from server.webvizarts.com  (server.webvizarts.com . [188.40.153.39])
    by mx.google.com with ESMTPS id ge6si41332059wjd.24.2015.02.19.06.26.03
    for <[email protected]>
    (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
    Thu, 19 Feb 2015 06:26:04 -0800 (PST)

电子邮件由server.webvizarts.com转发mx.google.com给[email protected]。显然没有设置信封发件人：

Authentication-Results: mx.google.com;
   spf=fail (google.com: domain of [email protected] does not designate 188.40.153.39 as permitted sender) [email protected]

显然信封的发件人仍然是[email protected]。

我能想到这里有三个选择：

  1. 使用重写信封发件人重写方案例如postfix-srsd。
  2. 发送/中继之前，在 Gmail 上进行身份验证
  3. 将电子邮件从您的服务器推送到 Gmail 的 IMAP/POP3 邮箱或让它们通过 Gmail 从您的服务器中提取（我不知道哪种方法更容易）

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