SmtpClient：如何获取发送失败的通知？
我希望从我的应用程序发送邮件的用户能够收到失败通知，并能够提取从其帐户发送的所有邮件的报告。
但这个问题的重点是取回失败的传递通知，我将如何设置监听它们的东西，以便我可以修改数据库中发送的电子邮件日志以反映这一点？
I want the users who send mail from my application to be able to be notified of failures as well as pull reporting for all mail sent from their account.
But this question is focused on the getting back failed delivery notifications, how would I setup something that listens for them so I could then modify the sent email log in my database to reflect this?
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由于 marc_s 刚刚使用了评论，所以我将继续在这里给出答案。
SMTP 客户端仅负责发送消息，并且很少获得有关消息成功状态的反馈。如果 SMTP 服务器出现故障或发生其他情况，则会出现异常，但通常 SMTP 服务器本身会处理实际的发送尝试。
Since marc_s just used a comment, I'll go ahead and put an answer here.
An SMTP Client is just responsible for sending messages, and gets very little feedback as to the success status of the message. It'll get an exception if the SMTP Server is down or something, but usually the SMTP Server itself handles the actual sending attempts.