通过雅虎发送邮件时出错？

Question

从 yahoo 发送电子邮件时出错。我已经尝试过端口25,995,465,587！我现在别无选择。如果有人能告诉我问题是什么，我将不胜感激？雅虎现在不支持smtp吗？我在某处读到这是付费服务还是其他什么？这是正确的吗？是因为这个原因，我无法通过服务器吗！我可以成功地从我的 gmail 帐户发送电子邮件，其中“收件人”和“发件人”相同，并且我还从 gmail 向雅虎发送了一封邮件，但相反的操作不起作用！

 MailMessage mail = new MailMessage();
 mail.From = new MailAddress([email protected]);
 //***Enter recievers Email here (TVC)
 mail.To.Add(new MailAddress("[email protected]"));
 mail.Subject = "This is some text";
 mail.Body = "This is the body";
 SmtpClient client = new SmtpClient("plus.smtp.mail.yahoo.com",995);
 client.Credentials = new System.Net.NetworkCredential("[email protected]", "pass");
 client.EnableSsl = true;
 client.Send(mail);
 MessageBox.Show("Mail Sent Successfully!", "Success", MessageBoxButtons.OK);

我得到以下异常

System.Net.Mail.SmtpException was unhandled
Message=Failure sending mail.
Source=System
StackTrace:
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at WindowsFormsApplication1.frmSelfAssessment.mailToTVC()
   at WindowsFormsApplication1.frmEnterEmail.button1_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.RunDialog(Form form)
   at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
   at System.Windows.Forms.Form.ShowDialog()
   at WindowsFormsApplication1.frmSelfAssessment.btnSubmit_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.UserControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at WindowsFormsApplication1.Program.Main()
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()
   InnerException: System.IO.IOException
   Message=Unable to read data from the transport connection: net_io_connectionclosed.
   Source=System
   StackTrace:
        at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine)
        at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)
        at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)
        at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
        at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
        at System.Net.Mail.SmtpClient.GetConnection()
        at System.Net.Mail.SmtpClient.Send(MailMessage message)
   InnerException:

使用 try catch 块后，这就是我得到的

System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.
at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine)
at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)
at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.GetConnection()
at System.Net.Mail.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at WindowsFormsApplication1.frmSelfAssessment.mailToTVC() 

Answer 1

我不认为你能做到这一点，除非你是雅虎！加帐户持有人。

阅读此内容： http://help .yahoo.com/l/us/yahoo/mail/classic/mailplus/pop/pop-08.html

这是链接：发送邮件超时错误
（OP从来不相信它，所以它没有被标记为答案。请注意，另一个答案也没有标记，这意味着OP没有得到解决方案）

PS：我刚刚检查过通过“smtp.yahoo.com发送邮件” ” 465端口，也被强行关闭了。所以到目前为止，它还不起作用。

希望这有帮助。

Answer 2

一个好的起点是尝试手动执行此操作。只需使用 telnet 连接到该服务器的端口 25，执行此 页面上所述的命令。

这样你就可以看到在它破裂之前你能走多远。

Answer 3

如果将代码包装在 try / catch 块中并调试异常，您将收到一条更有意义的消息，告诉您问题是什么。