blocks|key|3058910|text|如果您的SmtpMail.Send(message)方法没有返回错误，这意味着电子邮件已发送到SMTP服务器，那么您不在您的管辖范围内，这就是您所能知道的程度。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3058911|entityMap^0|4|M|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

if your <code>SmtpMail.Send(message)</code> method returns no error, it means the email was sent to the SMTP server, then you are out of your jurisdiction, that is how far you can know.

blocks|key|3058949|text|将.Send(msg)方法放在try+catch块中，并捕获SmtpFailedRecipientException。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3058950|try
{
++++mail.Send(msg);
}
catch+(SmtpFailedRecipientException+ex)
{
++++//+ex.FailedRecipient+and+ex.GetBaseException()+should+give+you+enough+info.
}|code-block|syntax|javascript|3058951|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Put the .Send(msg) method in a try catch block, and catch SmtpFailedRecipientException.

<pre><code>try
{
 mail.Send(msg);
}
catch (SmtpFailedRecipientException ex)
{
 // ex.FailedRecipient and ex.GetBaseException() should give you enough info.
}
</code></pre>

blocks|key|312787|text|如果您使用的是System.Net.Mail，请尝试|type|unstyled|depth|inlineStyleRanges|entityRanges|data|312788|message.DeliveryNotificationOptions+=+System.Net.Mail.DeliveryNotificationOptions.OnSuccess;|code-block|syntax|javascript|312789|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you're using System.Net.Mail try out

<pre><code>message.DeliveryNotificationOptions = System.Net.Mail.DeliveryNotificationOptions.OnSuccess;
</code></pre>

blocks|key|3272176|text|根据spec的说法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3272177|S:+220+smtp.example.com+ESMTP+Postfix
C:+HELO+relay.example.org
S:+250+Hello+relay.example.org,+I+am+glad+to+meet+you
C:+MAIL+FROM:<bob@example.org>
S:+250+Ok
C:+RCPT+TO:<alice@example.com>
S:+250+Ok
C:+RCPT+TO:<theboss@example.com>
S:+250+Ok
C:+DATA
S:+354+End+data+with+<CR><LF>.<CR><LF>
C:+From:+"Bob+Example"+<bob@example.org>
C:+To:+Alice+Example+<alice@example.com>
C:+Cc:+theboss@example.com
C:+Date:+Tue,+15+Jan+2008+16:02:43+-0500
C:+Subject:+Test+message
C:
C:+Hello+Alice.
C:+This+is+a+test+message+with+5+header+fields+and+4+lines+in+the+message+body.
C:+Your+friend,
C:+Bob
C:+.
S:+250+Ok:+queued+as+12345
C:+QUIT
S:+221+Bye
{The+server+closes+the+connection}|code-block|syntax|javascript|3272178|一旦服务器说250+Ok:+queued+as+12345，你就不能确定它是否真的发送了一封电子邮件，或者它是否已经送达。|style|CODE|3272179|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#Protocol_overview^0|2|4|0|0|0|6|N|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

According to <a href="http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#Protocol_overview" rel="noreferrer">spec</a>:

<pre><code>S: 220 smtp.example.com ESMTP Postfix
C: HELO relay.example.org
S: 250 Hello relay.example.org, I am glad to meet you
C: MAIL FROM:&lt;bob@example.org&gt;
S: 250 Ok
C: RCPT TO:&lt;alice@example.com&gt;
S: 250 Ok
C: RCPT TO:&lt;theboss@example.com&gt;
S: 250 Ok
C: DATA
S: 354 End data with &lt;CR&gt;&lt;LF&gt;.&lt;CR&gt;&lt;LF&gt;
C: From: "Bob Example" &lt;bob@example.org&gt;
C: To: Alice Example &lt;alice@example.com&gt;
C: Cc: theboss@example.com
C: Date: Tue, 15 Jan 2008 16:02:43 -0500
C: Subject: Test message
C:
C: Hello Alice.
C: This is a test message with 5 header fields and 4 lines in the message body.
C: Your friend,
C: Bob
C: .
S: 250 Ok: queued as 12345
C: QUIT
S: 221 Bye
{The server closes the connection}
</code></pre>

As soon as server says <code>250 Ok: queued as 12345</code>, you cannot know for sure if it had really sent an email or not, or whether it was delivered.

blocks|key|312791|text|您可以使用DeliveryNotificationOptions接收收据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|312792|如果您有一个名为MailMessage的邮件对象，请执行以下操作：|offset|length|style|CODE|312793|mail.DeliveryNotificationOptions+=+DeliveryNotificationOptions.OnSuccess;|code-block|syntax|javascript|312794|entityMap^0|0|8|B|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can use the DeliveryNotificationOptions to receive a receipt.

If you have a <code>MailMessage</code> object named mail, do this:

<pre><code>mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
</code></pre>

blocks|key|315849|text|不是的。电子邮件(基于SMPT)是一种不可靠的传输协议，虽然有一些黑客可以检测电子邮件是否已被接收和阅读，例如，通过在电子邮件中嵌入个性化图像URL并跟踪图像是否已被接收者的客户端请求，但没有绝对可靠的方法来满足您的请求。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|315850|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

No. E-mail (SMPT based) is an unreliable transport protocol and although there are some hacks to detect that an e-mail has been received and read, e.g. by embedding an individualized image URL in the e-mail and tracking that the image has been requested by the recipient's client, there is no absolutely reliable way to fulfil your request.

blocks|key|317912|text|如果发送时出现问题，SmtpClient.Send方法将引发异常。但是，除了将该消息发送到SMTP服务器之外，还无法知道它是否能从那里到达目的地。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|317913|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/swas0fwc.aspx^0|A|F|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The <a href="http://msdn.microsoft.com/en-us/library/swas0fwc.aspx" rel="nofollow noreferrer">SmtpClient.Send</a> method will raise an Exception if there's a problem sending. But beyond getting that message to the SMTP server, there's no way to know if it makes it to the destination from there.

blocks|key|312809|text|我正在使用gmail+SMTP在我的程序中发送邮件。即使使用SmtpFailedRecipientException陷阱，发送的假邮件也会返回正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|312810|但当我查看我的gmail收件人outlook时，我发现发送的邮件并没有说明原因。使用主题传送状态通知(失败)|312811|我的问题是，有没有可能在程序中得到这个通知。|312812|我找到了这个，但不是给爸爸的|312813|Notify+C#+Client,+when+SMTP+Server+receive+a+new+Email|offset|length|312814|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/7358322/notify-c-sharp-client-when-smtp-server-receive-a-new-email^0|0|0|0|0|0|1I|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$J|Y|K|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I'am using gmail SMTP for sending mails with my program. A fake mail sent returns Ok even with SmtpFailedRecipientException trap.

But when I check with outlook my gmail recipient I see that mail was not sent with explanation. With a subject Delivery Status Notification (Failure)

My question is it possible to get this notificiation whitin the program.

I found this but it's not for POP

<a href="https://stackoverflow.com/questions/7358322/notify-c-sharp-client-when-smtp-server-receive-a-new-email">Notify C# Client, when SMTP Server receive a new Email</a>

I am developing an Asp.Net application, where I am sending a mail to the user's email address, if he forgets the password.

I want to check if the mail has been sent sucessfully or not.
Is there any method to know that for sure.

EDIT

In case if an email id does'nt exists, then would I detect a failure.

How to check if the mail has been sent successfully

服务器

我正在开发一个Asp.Net应用程序，在这个应用程序中，如果用户忘记了密码，我会向他的电子邮件地址发送一封邮件。我想检查一下邮件是否发完了。有没有方法可以确定这一点。编辑如果电子邮件id不存在，我会检测到失败吗？

问如何检查邮件是否已成功发送
EN

回答 8

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