接收已成功发送和失败消息的通知

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当您想获取已成功发送和失败消息的投递通知时，可以使用管道符 (|) 操作符来 DeliveryNotificationOptions 属性的 MailMessage 类。以下代码片段演示如何接收已成功发送和失败消息的通知。

// Create the message
MailMessage msg = new MailMessage();
msg.setFrom(MailAddress.to_MailAddress("sender@sender.com"));
msg.setTo(MailAddressCollection.to_MailAddressCollection("receiver@receiver.com"));
msg.setSubject("the subject of the message");

// Set delivery notifications for success and failed messages and Add the MIME headers
msg.setDeliveryNotificationOptions(DeliveryNotificationOptions.OnSuccess | DeliveryNotificationOptions.OnFailure);
msg.getHeaders().add("Read-Receipt-To", "sender@sender.com");
msg.getHeaders().add("Disposition-Notification-To", "sender@sender.com");

// Send the message
SmtpClient client = new SmtpClient("host", "username", "password");
client.send(msg);
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