C＃中的SMTP电子邮件发送代码失败，雅虎邮箱，但为其他服务器工作正常，谁能帮助？ [英] C# SMTP email sending code fails for Yahoo Mail but works fine for other servers, can anyone help?

问题描述

我使用这个代码通过雅虎SMTP服务器发送SMTP电子邮件，它是一个个人项目，我写。

I am using this code to send an SMTP email via the yahoo SMTP server, it is for a personal project I am writing.

using System.Net.Mail;
using System.Net;

SmtpClient theClient = new SmtpClient("smtp.mail.yahoo.com", 465);
theClient.UseDefaultCredentials = false;
theClient.Credentials = new NetworkCredential("username", "password");
theClient.EnableSsl = true;

MailMessage theMessage = new MailMessage("[e-mail]", 
                                         "[e-mail]");

theMessage.Subject = "Dave test from C# subject";
theMessage.Body = "Dave test from C# body";

theClient.Send(theMessage);

这是用于发送SMTP电子邮件都非常标准的代码，但是...服务器似乎抛出一个错误。它强行终止连接。 。如果我使用其他SMTP服务器，如Gmail时，Windows Live或其他各种ISP的SMTP服务器不会发生这种情况。

It's all pretty standard code for sending SMTP email, but... the server seems to throw an error. It forcibly terminates the connection. This does not happen if I use other SMTP servers like Gmail, Windows Live or various other ISP Smtp servers.

这是异常和堆栈跟踪：

System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at ConsoleApplication1.Program.Main(String[] args) in E:\dev\ARCSoftware.FTPProcessor\ConsoleApplication1\Program.cs:line 28

我知道这个问题是不是环保，虽然我可以发送到同一个服务器使用Outlook Express这些精确的设置。我想知道如果我需要发送证书什么的？

I know the problem is not environmental though as I can send to the same server with these exact settings using Outlook Express. I am wondering if I need to send a certificate or something?

如果您或任何你知道哪里有这方面有任何想法，我将不胜感激一些帮助。

If you, or anyone you know where has any ideas about this I would greatly appreciate some help.

推荐答案

这不是通过465的支持，但下面的帖子详细介绍一种解决方法

It's not supported through 465, but the following post details a workaround

我如何通过SSL发送电子邮件与.NET Framework SMTP

更新：此链接的详细信息为什么它可能是通过Outlook Express的工作，但不是通过System.Net.Mail

UPDATE: This link details why it might work through Outlook Express, but not through the System.Net.Mail

的 http://blogs.msdn.com/b/webdav_101/archive/2008/06/02/system-net-mail-with-ssl-要进行身份验证，对多端口465.aspx

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