如何防止 Lotus Notes 用户转发或复制通过 System.Net.Mail 发送的邮件？
我想使用 SMTP 客户端 uiing microsft.net 以 C# 作为编程语言发送电子邮件。但是对于通过 SMTP 客户端发送的电子邮件，我们是否可以添加“禁止转发”或“禁止复制”等安全功能。我不希望电子邮件的收件人转发或复制电子邮件的内容。
I want to send email using SMTP client uiing microsft.net with C# as programming language. But for the emails sent through SMTP client, can we add security features like "no forwarding" or "no copying" etc. I dont want recipients of the email to forward or copy the content of the email.
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简单的回答：不。你无法阻止人们复制到达他们机器上的东西。
如果您解释一下为什么要尝试这样做，也许我们可以提供一个实用的替代方案。例如，如果您不希望机器人读取文本，则可以将其放在图像中。如果您不想分发二进制附件，有多种 DRM 可能适合您。
编辑
专有客户端（例如 Lotus Notes）可以根据消息附带的元数据禁用自身；但这仍然是自愿的。您可能会编写一个不兼容的 Notes 客户端来忽略此类限制。
编辑
我没有想到您的用户可能都在使用 Notes 客户端。在这种情况下，@Peter J 的解决方案可能就是您所需要的。
Simple answer: no. You can't keep people from copying something that's reached their machine.
If you explain why you're trying to do this, maybe we could offer a practical alternative. For example, if you don't want your text to be read by a robot, it could be in an image. If you have a binary attachment you don't want distributed, there are various kinds of DRM that may work for you.
Edit
A proprietary client (such as Lotus Notes) can disable itself based on metadata that comes with the message; but that's still voluntary. You could probably write a non-compliant Notes client that ignores such restrictions.
Edit
It didn't occur to me that your users might all be using the Notes client. In that case, @Peter J's solution may be what you need.
Lotus Notes（邮件客户端）查看“Sensitivity”标头。使用 System.Net.Mail，您可以通过以下方式完成同样的事情（仅当您的用户都使用 Lotus Notes 时）：
Lotus Notes 电子邮件客户端将禁止转发或复制，就像您使用 Lotus Notes COM 一样目的。
Lotus Notes (the mail client) looks at the "Sensitivity" header. Using System.Net.Mail, you can accomplish the same thing (ONLY if your users are all using Lotus Notes) by using the following:
The Lotus Notes email client will disallow forwarding or copying, just as if you had used the Lotus Notes COM object.
通过电子邮件向他们发送一个需要他们登录的链接。或者，如果您的所有用户都在同一台 Exchange 服务器上，您可以实施 Exchange 的信息权限管理。否则，您可以考虑发送加密电子邮件。但仍然没有什么可以阻止他们复制它，无论是截图、用相机拍照等。
Email them a link that requires them to login. Or, if all of your users are on the same Exchange server, you could implement Exchange's Information Rights management. Otherwise you could look into sending encrypted emails. But there is still nothing to prevent them from copying it, be it by taking a screenshot, a picture with a camera, etc.