什么是未读报告？
MSDN 上的这篇文章中解释了电子邮件的消息类别。它指出前缀“REPORT”表示自动消息，子类型在后缀中定义：
- DR：交付报告
- NDR：未交付报告
- IPNRN：已读报告
- IPNNRN：未读报告
现在我问自己：最后一种类型是否存在，因为如何您会收到有人没有阅读电子邮件的报告吗？例如，如果您关闭 Outlook 中的“发送已读回执”对话框，则不会发生任何情况。它只是不发送“IPNRN”。正确的？
如果它确实存在，我怎样才能触发它？
In this article on MSDN the message classes for email are explained. It states that the prefix "REPORT" indicates an automated message and the subtype is defined in the suffix:
- DR: Delivery report
- NDR: Nondelivery report
- IPNRN: Read report
- IPNNRN: Nonread report
Now I ask myself: does this last type even exist because how would you ever get a report of someone not reading an email? E.g. if you dismiss the "send read receipt" dialog in Outlook, nothing happens. It just doesn't send the 'IPNRN'. Right?
If it does exist, how can I trigger one?
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IPNNRN 代表人际笔记未收到通知。未读回执与已读回执类似，只不过它们通知发件人收件人在未打开邮件的情况下删除了邮件。。未读回执是由收件人的消息客户端而不是邮件服务器生成的。
我从 Exchange 2003 技术手册中找到了此解释。
我不知道可以配置哪些电子邮件客户端来发送这些内容，但您可以使用 Outlook 来体验这一点。如果您向已打开自动已读回执响应的 Outlook 客户端发送了一封带有标准已读回执请求的电子邮件，并且该客户端在未阅读该电子邮件的情况下删除了该电子邮件，则 Outlook 将发送IPNNRN 返回给发送者。
IPNNRN stands for The Interpersonal Note Non-Receipt Notification. Non-read receipts are similar to read receipts, only they inform a sender that a recipient deleted a message without opening it. Non-read receipts are generated by the messaging client of the recipient, not a mail server.
I found this explanation from an Exchange 2003 tech manual.
I don't know what e-mail clients can be configured to send these, but you can experience this using Outlook. If you sent an e-mail with a standard read-receipt request to an Outlook client that had automatic read-receipt response turned on, and the client deletes the e-mail without reading it, Outlook will send a IPNNRN back to the sender.