阻止收件人收到电子邮件。 - 电子邮件处理如何运作？
当您发送带有以下内容的电子邮件时：
From: [email protected]
To: [email protected], [email protected], [email protected]
CC: [email protected]
哪个邮件服务器通过电子邮件将消息发送给“收件人”和“收件人”中的收件人。 CC领域？是 SMTP 服务器还是收件人拥有的服务器（如 aol.com）？
When you send an email with this:
From: [email protected]
To: [email protected], [email protected], [email protected]
CC: [email protected]
Which Mail Server sends the message via email to the recipients in the TO & CC field? Is it the SMTP server or the server owned by the recipient (like aol.com)?
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当您编写电子邮件并发送它时，您会将其交给您有权访问的某个 SMTP 服务器。然后，该服务器将联系收件人服务器（或中间服务器）并将电子邮件传送到该 SMTP 服务器。接收端的 SMTP 服务器将根据其设置以某种方式将电子邮件传送给其用户。
在您的示例中，您将正确向 yahoo.com 的 SMTP 服务器提供电子邮件。然后该服务器将联系 aol.com 并将电子邮件发送到那里。它还会联系 gmail.com 并将电子邮件发送到他们的 SMTP 服务器。
您应该阅读 SMTP rfc 的这一部分，其中有一个非常好的内容有关该过程的解释。
您将如何阻止电子邮件的发送，是以某种方式控制在此过程中联系的 SMTP 服务器之一 - 或者根本不发送电子邮件。当您看到您自己的邮箱中发送的电子邮件时，最好是尝试阻止其他收件人收到该电子邮件。
When you write an email and send it, you will hand it off to some SMTP server you have access to. That server will then contact the recipients server (or intermediate server) and deliver the email to that SMTP server. The SMTP server on the receiving end will somehow, depending on their setup, deliver the email to their users.
In your example, you will properly give yahoo.com's SMTP server the email. Then that server will contact aol.com and deliver the email there. It will also contact gmail.com and deliver the email to their SMTP server.
You should read this part of the SMTP rfc which have a very good explanation about the process.
How you will go about preventing that an email is delivered, is to somehow control one of the SMTP servers that is contacted in the process - or not send the email at all. When you see the email delivered in your own mailbox, it is properly way to late trying to prevent the other recipients receiving the email.