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20th Feb 2024
Partial Safe SPF for Non-flattenable SPF Includes

While Safe SPF overcomes the 10-DNS-lookup limit in SPF, sometimes it's desirable to flatten only a part of your SPF record, while leaving the rest as is. If this is the case, you can use partial Safe SPF.

One good reason for this is that some email delivery services like HelpScout, Office 365, At…

SPF SPF PermError Too Many DNS Lookups
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20th Feb 2024
不验证不投递:不要让电子邮件被归类为垃圾邮件或者被拒绝

"不验证不投递"是电子邮件行业的一句行话,意思是如果一封邮件没有被成功验证的话,将不会被投递。这里验证指的是基于现代的技术 SPF, DKIM, 和 DMARC 对电子邮件进行检查并核实邮件的真实性。

换句话说,如果邮件没有被验证,那么它将会被放到垃圾邮件文件夹,或者被直接拒收。

什么是电子邮件验证 (email authentication)

电子邮件验证是一种基于 DNS 的机制,它使得接收邮件的服务器能够检查邮件是否真的来自发送者所声称的主机。举个例子,如果邮件号称来自 (From address: joe@example…

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20th Feb 2024
多个 DKIM 签名

当查看邮件中的头域时,有时候会在一封邮件中找到多个 DKIM 签名。

类似地,在一些 DMARC 聚合报告中,也可以在一条邮件流中发现多个 DKIM 签名。

我们将会在下面讨论多个 DKIM 签名的情形。

为什么邮件会有多个 DKIM 签名

当邮件被转发的时候,多个 DKIM 签名可能会被添加到邮件中。

举个例子,如果用 SendGrid 发送一封邮件到 Gmail,然后该邮件被转发到最终的接收人。该接收人会在邮件中找到 2 个 DKIM 签名:一个由 SendGrid 添加,另一个由 Google 添加。

电子邮件头域包含多个 DKIM 签名的例子

下面的邮件头域…

DKIM
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20th Feb 2024
SPF 简介
什么是 SPF

发送者策略框架 (Sender Policy Framework, SPF) 是一种电子邮件验证机制,它使得只有被允许的发送者代表域名发送邮件,并且阻止未被允许的用户这样做。SPF 允许接收服务器检查邮件是否真的来自域名管理者指定的 IP 地址。

比如,当一个恶意的邮件服务器试图将邮件投递到您的邮箱,该邮件号称来自 trustedbank.com,并且要求获取重要并且秘密的信息,这为您和您的邮箱服务提供商带来了安全上的问题。如果邮件服务器不对邮件做任何安全检查的话,该邮件将会抵达收件箱,并有可能引起财务损失。

SPF 能够解决这个问题。这是它的工作原理:假设 S…

SPF
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20th Feb 2024
How to Use a Dedicated DMARC Analyzer Service to Set Up DMARC with p=reject (Full DMARC Implementation)

This tutorial provides step-by-step instructions on how to set up DMARC starting from p=none, transition to p=quarantine, then to p=reject using DMARCLY, a dedicated DMARC analyzer service.

The tutorial assumes no prior knowledge whatsoever of DMARC or DMARC reports…

DMARC DMARC Analyzer Service DMARC Monitoring Service Set Up DMARC DMARC Implementation p=none p=quarantine p=reject
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20th Feb 2024
How to Set Up SPF and DKIM for Zendesk

When you first set up Zendesk to send emails, you may find there is a "Via Zendesk" warning for the email in the recipient's mailbox.

This warning means you haven't authorized Zendesk to deliver emails for you, so the mailbox provider considers that sent from Zendesk instead of your brand…

SPF DKIM Zendesk Email domain authentication
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